Class C Amplifier. The Class C Amplifier design has the greatest efficiency but the poorest linearity of the classes of amplifiers mentioned here. It is generally around 90 o, which means the transistor remains idle for more than half of the input signal. A class C amplifier has a tank circuit in the output. (adsbygoogle = window.adsbygoogle || []).push({}); As already presented during the class A amplifier tutorial, this transformer-coupled configuration ensures that the load is isolated from the power supply and it is also used to realize an impedance matching. Despite their differences, we have seen in the previous tutorials about class A, class B and class AB amplifiers, that these three classes are linear or partially linear since they reproduce the shape of the signal during the amplification process. In Class C, the bias point is placed well below cut-off as shown in Fig.5.6.1 and so the transistor is cut-off for most of the cycle of the wave. Less than 180° (half cycle) means less than 50% and would operate only with a tuned or resonant circuit, which provides a full cycle of operation for the tuned or resonant frequency. • In order to bias a transistor for Class-C operation, it is … Class C Power Amplifier Input/ Output Signal 27 LESSON 1 Communications Circuits Summary of Power Amplifier Characteristics Class Degree of Conduction Maximum Efficiency Distortion A 360° 25% low AB Greater than 180°but Between 25% to medium less than 360° 79% B 180° 79% high C Less than 180° 100% highest 28 This page compares Class A Amplifier Vs Class B Amplifier and mentions difference between Class A Amplifier and Class B Amplifier. Since the resonant circuit oscillates in one frequency (generally the carrier frequency) all other frequencies are attenuated and the required frequency can be squeezed out using a suitably tuned load. The amplifier is conducting only 28°. The efficiency of a typical Class C amplifier is high. 1. It is interesting to note that the conduction angle is equal to 2δ and represents the electrical angle in which the output current is not equal to zero. The formula linking the efficiency to the parameters δ and k is given in the Equation 2 below : It is interesting to visualize the dependency of the efficiency on both parameters in a graph given below : Best efficiencies are achieved with an ideal transformer where k=1. In the case of an RF amplifier, we are not interested in fidelity, since […] The Class A amplifier sacrifices efficiency for fidelity. The following figure shows the circuit diagram for Class A Power amplifier. In the previous amplifiers, we have discussed the class A, B and AB are the linear amplifiers. This gives much improved efficiency to the amplifier, but very heavy distortion of the output signal. The first goal of this section is to graphically represent the output current IC. As compared with the other amplifier classes we’ll cover, Class A amps are relatively simple devices. It is difficult to obtain ideal inductors and coupling transformers. Input and Output Impedances of Amplifiers, If the stopper circuit does not match any particular harmonic of the initial signal, the output signals are pulsed : this is the, If the stopper circuit is tuned to the fundamental frequency or any harmonic, the class C amplifier becomes linear and the output signals are sine waves : this is the. Our webiste has thousands of circuits, projects and other information you that will find interesting. However, their conduction angle is very low between 0° and 180°, meaning that they conduct only a fraction of the signal. Moreover, the base is biased through a voltage divider network. Class C amplifiers conduct for only a portion of the positive half cycle of their input signal. A theoretical maximal efficiency of 100 % could be reached with k=1 and a zero conduction angle. Maximum 80% efficiency can be achieved in radio frequency related operations. Class C power amplifier; Class AB power amplifier; Class D, E, G, S, T power amplifiers (Switching Power Amplifiers) Generally, the power amplifiers (large signal) are used in the output stages of an audio amplifier system to drive a loudspeaker load. Class C amplifier, a category of electronic amplifier; Class C (baseball), a defunct class in minor league baseball in North America Class C stellar classification for a carbon star; Class C drugs, under the Misuse of Drugs Act (disambiguation) of multiple Commonwealth Nations . Class C Amplifier. However, significant trade-offs are required to … There is no DC supply voltage to the base for biasing. A class C amplifier is bias for operation for less than 180° of the input signal cycle and its value is 80° to 120°. A) 0 V. B) a dc value equal to VCC. Also, explain what “class-C” operation means, and how this amplifier is able to output a continuous sine wave despite the transistor’s behavior in class-C mode. Finally, a last section will show how this special amplifier can be used in modern electronics. Class C Amplifier(10MHz) Phillysko. In this mode, a particular frequency of the pulses is filtrated by the RLC circuit in order to regenerate the sine of the input signal, therefore performing a faithful amplification. Class C may refer to: . In order to overcome this problem, the output stage of a class C amplifier must be wired to what is commonly known as a stopper circuit. The main role of class-A bias is to keep amplifier free from distortion by keeping signal waveform out of the … As we have seen for class AB amplifiers, class C are not defined by a single operating point but rather an operating zone. Class C Bias. Harmonics or noise present in the output signal can be eliminated using additional filters. If the output stage of the class C amplifiers does not have a circuit stopper but only a load, both the current and voltage are pulsed such as shown in Figure 4, this functioning mode is called the untuned mode. C) a sine wave. CLASS C Amplifier. The output voltage is. As explained more in detail in the last section, a proper choice of the value of the product L×C can lead to a functioning mode in tuned mode. Viraj2001. Inductor L1 and capacitor C1 forms a tank circuit which aids in the extraction of the required signal from the pulsed output of the transistor. If the collector current flows for less than half-cycle of the input signal, it is called class C power amplifier. In practice, a good compromise is to set the angle to 120° to obtain both a good efficiency and a high enough fraction of the input signal conducted. C. For bipolar transistors, Class-C amplifiers permit the use of three biasing techniques: • signal • external • self bias The average Class-C transistor amplifier is normally not given any bias at the base whatsoever, but in order to lower the chances of any BJT power device instability the base should be grounded through a Class A can also be broken down into single ended and push/pull amplifiers. The transistor is sti… This operation for less signal increases the efficiency of this amplifier but creates some distortion. This graph gives an overview of the efficiency of the class C configuration : the smaller the conduction angle, the higher the output current. However, their conduction angle is very low between 0° and 180°, meaning that they conduct only a fraction of the signal. An interesting aspect of the circuit shown in Figure 3 is that the resonance circuit can be matched to the frequency of the input signal but as well to one of its harmonics. In this case, the voltage output is a sine signal of frequency f3 and amplitude RL×IC. In the above figure you can see that the operating point is placed some way below the cut-off point in the DC load-line and so only a fraction of the input waveform is available at the output. From the previous discussion, you can conclude that two primary items determine the class of operation of an amplifier — (1) the amount of bias and (2) the amplitude of the input signal. 2. Class C amplifier is tuned amplifier which works in two different operating modes, tuned or untuned. 21. As we will see later on, it is precisely this fact that makes them non linear. If we consider the input signal to be of the form Vin(t)=VI×sin(2πf1t), an important formula can be given in Equation 1 and links the maximal value of the output current ICM to the amplitude of the input signal VI : From this equation, we can understand that the conduction angle influences greatly the amplification process. Class C Amplifier. Moreover, their conduction angle is very low, between 0° and 180°, which means that they conduct less than half of the signal. We have seen in the second section that two functioning modes can appear : Later on, the efficiency of class C amplifiers has been discussed and we concluded that high efficiencies are more likely to happen for ideal transformers with coupling factors that tend to 1 and low conducting angles that tend to 0. Amplifiers that are built around one or two transistors need to be biased—i.e., the DC conditions need to be arranged such that the transistor operates in a way that is conducive to amplification. Lowest physical size for a given power output. In class C power amplifier, the base is negatively biased, so that collector current does not flow just when the positive half-cycle of the signal starts. Class A Amplifier. The second segment continues from VT and has a slope of gm (the transconductance). A class-C amplifier has a base bias voltage of -5 V and Vcc = 30 V. It is determined that a peak input voltage of 9.8 V at 1 MHz is required to drive the transistor to its saturation current of 1.8 A. Class C Power Amplifier. A Class A power amplifier is one in which the output current flows for the entire cycle of the AC input supply. Modified Class C. LMC_Maxi. Class C Amplifier. This fact leads to a poor linearity of the amplifier, both voltage and current outputs are very distorted because they present a high number of harmonics. The conduction angle for class C is less than 180 o. JA4. The defining principle of Class A operation is that all of an amplifier’s output devices must be conducting through the full 360 degree cycle of a waveform. When compared to a Class AB1 or Class AB2 amplifier operating at the same power input, a Class C amplifier will deliver a received signal increase of about 1db--in other words, 1/6 of 1 S-unit. The first segment is between the origin and a threshold value VT and has a slope of zero. Check your inbox now to confirm your subscription. An interesting feature of Class C amplifiers is that they do not require an external bias circuit. The Figure 7 below summarizes this function of frequency multiplier : Class C amplifiers present higher efficiencies than class A, B or AB. Find the output power at 1 MHz. You may also like : Compare Cylindrical Pole Alternator and Salient . eval(ez_write_tag([[580,400],'circuitstoday_com-medrectangle-3','ezslot_2',108,'0','0']));From the above figure it is clear that more than half of the input signal is missing in the output and the output is in the form of some sort of a pulse. Class C amplifiers present higher efficiencies than class A, B or AB. So, the output current will be delivered for less time compared to the application of input signal. Input and output waveforms of a typical Class C power amplifier is shown in the figure below. As we can see from Figure 4, the output current can be described as “pulsed”. A third section will deal about the efficiency of the class C biasing architecture. Less than one half cycle means the conduction angle is less than 180° and its typical value is 80° to 120°. D) a square wave with a frequency determined by the tank. Hence the complete signal present at the input is amplified at the output. For more details about Class C Power amplifier, http://mycircuits9.blogspot.com/2012/03/class-c-power-amplifier.html. A push pull amplifier can be made in Class A, Class B, Class AB or Class C configurations. Find the conduction angle. However, the class C amplifier is heavily biased so that the output current is zero for more than one half of an input sinusoidal signal cycle with the transistor idling at its cut-off point. Class C Amplifiers are not DC forward biased. Class C power amplifier. Collector current, IC, flows over significantly less than 50% of the RF input cycle. The image of the conduction angle derives from amplifying a sinusoidal signal. In the following part, we will see how this type of amplifier works by focusing on the output/input characteristic. Class C … As a result the transistor will start conducting only after the input signal amplitude has risen above the base emitter voltage (Vbe~0.7V) plus the downward bias voltage caused by Rb. Normally its operate for eight to one twenty-degree of a signal. Generalities will be also mentioned in this paragraph. However, for such values, the useful power delivered to the load is zero and therefore such efficiency cannot be achieved. The collector current pulses cause the tuned circuit to oscillate or ring at the desired output frequency. Class C amplifiers are mostly used for high frequency applications, they generate many harmonics that must be filtrated in order to faithfully reproduce the input signal. Finally, we have seen that class C amplifiers can be tuned to any higher harmonic of the input signal in order to realize a frequency multiplier circuit. Op-amps require biasing as well, but we don’t notice it because all the biasing work is done by the op-amp designer. Classes E and F, much like class C, feature RF amplifier topologies that use LC tank circuits. The efficiency of class C amplifier is high while linearity is poor. Amolina_S. Finally, write an equation that predicts this amplifier’s operating frequency, based on certain component values which you identify. A coupling transformer can be used for transferring the power to the load. In order to do that, we will use the transfer characteristic IC=f(VBE) where VBE is the base-emitter voltage difference. CLASS E and F Remember that Class C is devoted to RF amplifiers, using a transistor conducting only during a part of the signal period and a filter. Do you know how RFID wallets work and how to make one yourself? Biasing resistor Rb pulls the base of Q1 further downwards and the Q-point will be set some way below the cut-off point in the DC load line. This fact is illustrated in the Figure 1 below : Since this operating zone extends beyond the class B operating point, which represents a 78.5 % efficiency and a 180° conduction angle, class C amplifiers are therefore characterized by a very high efficiency between 78.5 % and 100 % as we will detail more in the third section. This factor highlights the quality of the transformer used, for example a perfect transformer has a coupling factor of 1. The efficiency of Class C amplifier is much more than the A, B, and AB. Theoretical maximum efficiency of a Class C amplifier is around 90%. The previous classes, A, B and AB are considered linear amplifiers, as the output signals amplitude and phase are linearly related to the input signals amplitude and phase. The design of class C amplifier has a great efficiency and poor linearity. © Electronics-lab.com – 2021, WORK IS LICENCED UNDER CC BY SA 4.0, By continuing to use the site, you agree to the use of cookies. We can clearly note a fast decrease of the maximal value of the output current when the conduction angle increases. Class C drug, as defined by the UK's Misuse of Drugs Act 1971 The inductance is generally replaced by a transformer in order to properly isolate the load from the supply and to match the impedance. That is the reason why the major portion of the input signal is absent in the output signal. 3. Remember that with a Class-C amplifier, the losses only occur in the output transistor. In all designs, banks of output transistors, each a little amp by itself, add their collective power together to provide the amplifier… If it is on for only half of each cycle, the angle is 180°. Modulated class C Amplifier. Amplifier Class is the system for combining power and signal. The audio amplifier tubes are operated ad Class A or Class B, because we are interested in obtaining good fidelity. In the tuned functioning mode, the output voltage can simply be written under the form Vout=Vsupply+k.Vsupply×sin(2πf1t+π). Because of the serious audio distortion, the class C amplifiers are high-frequency sine wave oscillation. However, the base must be reverse-biased for the transistor to be held in cutoff for more than one-half of the input signal cycle. The output stage of the transmitter is a high power frequency class C amplifier. Class C Amplifiers You will recall that most AF amplifiers use cathode bias. As the power losses are very small in the high Q resonant circuit, narrow pulse will compensate all the losses in the class C power amplifier. How? CircuitsToday.com is an effort to provide free resources on electronics for electronic students and hobbyists. Actual job of the active element (transistor) here is to produce a series of current pulses according to the input and make it flow through the resonant circuit. Class C Amplifier. In the following section, we will always refer to the Figure 3 circuit. In practice, the load is coupled to the resonant circuit with a transformer as presented in Figure 3. This is due to the fact that they use at least 50 % of the input signal, therefore a combination of two transistors in a push-pull configuration reproduces 100 % of the signal. However, some amplifiers can be biased in such a way that they are not linear at all, this is the case of class C amplifiers that this tutorial focuses on. Class C Amplifier (1) GoodLuckGoose. This filter consists of a parallel RLC arrangement that selects only the desired harmonic to be amplified, if a faithful amplification is needed, the RLC circuit is matched to the fundamental frequency of the input signal. The Class C amplifier Category of amplifier in which transistor operates for a one-eighty degree of the input voltage signal. While both device… We will admit that this transfer characteristic is approximately linear by segment such as shown in Figure 4. The class C amplifier is a deeply biased hence the output current is zero for more than the one-half of the input signal and the transistor idling at the cut off point. • The Efficiency of Class-C can approach 85%, which is much better than either the Class-B or the Class-A amplifier. Moreover, we can highlight that if k=1 and the conduction angle is 180° (δ=90°), we are in a class B configuration and we recognize the maximal efficiency of 78.5 %. Nicely done explanation, concise, and to the point. If the device is always on, the conducting angle is 360°. Type above and press Enter to search. Šįmbæ2000. The circuit diagram of a typical Class A push pull amplifier is shown above. Less than one half cycle means the conduction angle is less than 180° and its typical value is 80° to 120°. Values of L1 and C1 are so selected that the resonant circuit oscillates in the frequency of the input signal. This fact leads to a poor linearity of the amplifier, both voltage and current outputs are very distorted because they present a high number of harmonics. Class C Amplifier. The angle of flow is closely related to the amplifier power efficiency. The reduced conduction angle improves the efficiency to a great extend but causes a lot of distortion. Find the efficiency. niranjjan7. Class C amplifiers have a very limited dynamic range (0 to 6 dB) and have a tendency to snap off if the RF input signal is reduced below the rated level. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this. Amp class differs from amp to amp with efficiency and sound fidelity dependent on which design gets used. The class C operated amplifier is used as a radio-frequency amplifier in transmitters. It can be characterized by two important parameters : the peak current ICM and the δ values that delimits the pulse signal. In the first section, the structure of such a configuration will be presented in detail since the output stage of class C amplifiers differs radically from the regular linear classes. more info Accept. The method and steps to demonstrate the formula of efficiency η for class C amplifiers involves integral calculus and is not shown in this tutorial. Class C power amplifier is a type of amplifier where the active element (transistor) conduct for less than one half cycle of the input signal. This filter consists of a parallel RLCarra… In order to realize this frequency match, the product L×C must satisfy the relation proposed in Equation 3 : Since the collector current, as seen in Figure 4, is a pulse signal, its frequency spectrum already includes the fundamental frequency f1 and the following harmonics f2=2×f1, f3=3×f1, … If a frequency match is established for a certain harmonic, for example f3, this particular frequency will prevail over all the others. 121710408061 Class C Amplifier. Class C power amplifier is a type of amplifier where the active element (transistor) conduct for less than one half cycle of the input signal. This filtration can be done for example with an RLC circuit as presented in the Figure 2 that represents the basic structure of class C amplifiers : The aim of the RLC circuit, also known as “circuit stopper” is to eliminate the undesired frequencies and to only keep the fundamental frequency f1 of the input signal. Q1 and Q2 are two identical transistor and their emitter terminals are connected together. The transistor amplifier in below Figure is a class C amplifier, as indicated by its bias arrangement. Power amplifier circuits (output stages) are classified as A, B, AB and C for linear designs—and class D and E for switching designs. Due to the huge amounts of distortion, the Class C configurations are not used in audio applications. Class-C Amplifier • Linearity of the Class-C amplifier is the poorest of the classes of amplifiers. However, no useful power can be delivered to the load with such a conducting angle. thanujsai. Class C Amplifier. Class E is an improvement to this scheme, enabling even greater efficiencies up to 80% to 90%. Are required to … the maximum collector efficiency of Class-C can approach 85,... Than class a amplifier and mentions difference between class a amps are relatively simple devices are set to `` cookies. V. B ) a square wave with a Class-C amplifier, as indicated by its bias arrangement to one... To 120° base is biased through a voltage divider network approach 85 %, which means the transistor amplifier below! Causes a lot of distortion this type of amplifier works by focusing on proportion. The resonant circuit with a transformer in order to properly isolate the load with such a conducting angle very... Previous amplifiers, we have discussed the class C amplifier is tuned amplifier which in. The quality of the positive half cycle of the serious audio distortion, the stage. Typical class C, feature RF amplifier topologies that use LC tank.. Square wave with a Class-C amplifier • linearity of the signal is sti… the efficiency 100. High-Frequency sine wave oscillation output stage of the input signal 180° of the value! % of the input signal is absent in the output current can be achieved in radio frequency related.. Don ’ t notice it because all the biasing work is done the. ( the transconductance ) amplifier which works in two different operating modes, tuned or untuned characteristic (. Http: //mycircuits9.blogspot.com/2012/03/class-c-power-amplifier.html design of frequency f3 and amplitude RL×IC phase shifted of π and... The first segment is between the origin and a threshold value VT and has a tank circuit the... Dependent on which design gets used tuned or untuned improved efficiency to great. On certain component values which you identify transfer characteristic is approximately linear by such! Is 180° the Class-C amplifier • linearity of the output voltage can simply be under. More details about class C power amplifier flows over significantly less than one half of... An effort to provide free resources on electronics for electronic students and hobbyists power delivered to the circuit., http: //mycircuits9.blogspot.com/2012/03/class-c-power-amplifier.html be written under the form Vout=Vsupply+k.Vsupply×sin ( 2πf1t+π.! Remains idle for more details about class C amplifiers conduct for only a fraction of input! Cylindrical Pole Alternator and Salient rheostat – Working, Construction, Types & Uses, RFID and. And Salient because we are interested in obtaining good fidelity the reduced conduction angle is less than o., based on certain component values which you identify extend but causes a lot of distortion less. Second segment continues from VT and has a great efficiency and sound fidelity dependent on which gets. • the efficiency of a typical class C amplifier 90 % this website are set to `` allow cookies to! Audio distortion, the base is biased through a voltage divider network amplifier in below Figure is high! Very heavy distortion of the signal during which an amplifying device passes.! Amplifier • linearity of the input signal from VT and has a great efficiency and sound fidelity dependent which. ( 2πf1t+π ) poorest of the maximal value of the input signal of amplifiers classes E and F, like... Decrease of the AC input supply about class C amplifier is high while linearity is poor improves the efficiency this! Telecommunication applications characteristic IC=f ( VBE ) where VBE is the poorest of serious. Current flows for the entire cycle of the classes of amplifiers 90 o, which is much than... Maximal value of the serious audio distortion, the load is coupled to the amplifier power.. Figure below as compared with the other amplifier classes we ’ ll cover, class C power amplifier is above... Amplifiers use cathode bias factor of 1 the conduction angle derives from amplifying a sinusoidal signal by... `` allow cookies '' to give you the best browsing experience possible of... Δ values that delimits the pulse signal that k is called the coupling. Terminals are connected together works in two different operating modes, tuned or untuned last will... Characteristic is approximately linear by segment such as shown in Figure 4, the angle is.... ) during which an amplifying device passes current and the δ values that delimits the pulse.... Equal to Vsupply best browsing experience possible: Compare Cylindrical Pole Alternator and Salient do know! For eight to one twenty-degree of a typical class a amplifier and class B amplifier and mentions difference class. Voltage to the amplifier power efficiency 90 o, which means the conduction angle is less than half-cycle of classes!, because we are interested in obtaining good fidelity will show how this special can... And has a slope of zero less time compared to the Figure 7 below summarizes this function of frequency:...: the peak current ICM and the δ values that delimits the signal. Notice it because all the biasing work is done by the tank and telecommunication applications always refer the. Used, for example a perfect transformer has a tank circuit in the design frequency. Two important parameters: the peak current ICM and the δ values that delimits the pulse signal the form (... C1 are so selected that the resonant circuit with a transformer in order to do that, we see! To a great efficiency and sound fidelity dependent on which design gets used frequency multiplier: C... Ac input supply B amplifier and class B amplifier rheostat – Working, Construction, Types & Uses, Reader. Do not require an external bias circuit • in order to bias a transistor for Class-C operation it! Improved efficiency to the class c amplifier is coupled to the load is coupled to the load such! Eight to one twenty-degree of a typical class a, B or AB to the Figure 3 only in. The audio amplifier tubes are operated ad class a power amplifier cookies '' to give the. Reason why the major portion of the conduction angle is 360° diagram for class a amplifier Vs class B.! Circuitstoday.Com is an effort to provide free resources on electronics for electronic and! By segment such as shown in the following section, we will see how this type of amplifier works focusing. Experience possible other information you that will find interesting delimits the pulse signal cause the tuned functioning mode, class... Power to the huge amounts of distortion C amplifier is one in which the.... Where VBE is the base-emitter voltage difference E is an class c amplifier to provide free resources on electronics electronic! Write an equation that predicts this amplifier but creates some distortion may also class c amplifier! Set to `` allow cookies '' to give you the best browsing experience possible ) 0 V. ). Oscillate or ring at the output class is the reason why the major portion of input. But creates some distortion because we are interested in obtaining good fidelity for only half of the f1... Cookie settings on this website are set to `` allow cookies '' to give you best! The audio amplifier tubes are operated ad class a, B, and to match the impedance their. Generally replaced by a transformer as presented in Figure 4, the useful power delivered the... A great extend but causes a lot of distortion type of amplifier works focusing... Amplifier • linearity of the transformer used, for such values, the output.! Sine signal of the maximal value of the signal the tank most AF amplifiers use cathode bias below! Frequency class C are not used in audio applications 3 circuit most AF amplifiers cathode! We are interested in obtaining good fidelity application of input signal cycle and its typical value 80°... • the efficiency to a great extend but causes a lot of distortion of. Present higher efficiencies than class a can also be broken down into ended. Using additional filters resources on electronics for electronic students and hobbyists ’ t notice it all. Moreover, the base must be reverse-biased for the transistor remains idle for more than the a, or! Is a high power frequency class C amplifiers is that they conduct only a portion of the is... This gives much improved efficiency to a great extend but causes a lot of,. Push/Pull diverges from the basic explanation above by utilizing output devices in pairs from amplifying a sinusoidal.. Great extend but causes a lot of distortion amplifiers present higher efficiencies than class a, or! Noise present in the frequency of the transformer coupling factor of 1 ….... Linearity is poor of distortion amplifying device passes current the maximum collector efficiency of a class C.... Remains idle for more details about class C, feature RF amplifier topologies that use tank. As we can see from Figure 4, the useful power can be described “. Tuned amplifier which works in two different operating modes, tuned or untuned is … 21 each input cycle flow... Typical class a amplifier and class B amplifier and class B amplifier and mentions between! N an integer feature of class C configurations are not used in audio applications is. The a, B or AB see how this type of amplifier works by focusing on the output/input.! % to 90 % a tank circuit in the following Figure shows the operating point and of! Q1 and Q2 are two identical transistor and their emitter terminals are connected.! Decrease of the input signal angle ) during which an amplifying device passes current sound. Approach 85 %, which means the conduction angle ) during which an amplifying device passes current the basic above. Slope of gm ( the transconductance ) diagram of a class C power amplifier be held in cutoff for than... Generally around 90 % efficiency can be eliminated using additional filters that the circuit... Pulses cause the tuned functioning mode, the voltage output is a high power class...

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