The pulses of current charges the capacitor almost value equal to VCC as shown in below figure denoted as ‘a’.The impedance of resonant or tank circuitry is large near to the resonant frequency due to that gain is high only at this frequency value.The small-signal pulse of the collector current on every wave cycle of input starts and retains the oscillations of the resonant circuit due to that output voltage is generated as shown in figure denoted as b.The resonant frequency of resonant circuit can be calculated by the formula fr=1/(2Π√LC).So it is compulsory to use class c amplifier with the resonant circuit or tank circuit in parallel combination as shown in figure denoted as ‘a’.As the output or collector voltage is not replica to the input voltage then class c amplifier connected with resistance as the load is alone if there is no value in linear application exits.=(t on/T)Ic(sat)Vce (sat) Class C Amplifier Tuned Operation By supposing that complete load line is used the average power dissipation for complete signal wave will be.The transistor is operating or on for t on remains off for the remaining time interval.The power dissipation for on time of transistor will be.Ic(sat) and the min voltage amplitude is Vce(sat) for on-time of transistor. If the output is moved above the complete load the max current amplitude will be.For on-time of transistor collector current and the collector, voltage is shown in figure denoted as ‘b’. The time among the pulses T of ac input signal.In figure denoted as a pulses of collector current is shown.The power dissipation in class C amplifier is less since as we discussed above that it operates only some part of input waveform.If the complete ac load line is used as shown in figure denoted as ‘c’ the ideal extreme collector current will be Ic(sat) and ideal least collector voltage will be Vce(sat). For this duration, the transistor is off.The peak value of ac voltage source is larger than the ΙVBBΙ+VBE so base voltage crosses the potential barrier value of base-emitter junction for less time interval close to the positive peak of every cycle is shown in figure denoted as ‘b’.This circuitry is biased with the negative power source denoted as VBB less than cutoff region.The class C amplifier usually functioned with a resonant circuitry load due to that resistance as load is used to discuss the main idea.In the below figure the common emitter class C amplifier consisting of a load as resistance is shown in the below figure denoted as ‘a’.The main operation of class C amplifier is explained in below figure.So let’s get started with Introduction to Class C Amplifier. In today’s post, we will have a detailed look at its working, circuit arrangements and some related parameters. It not used for linear application circuits. It means that power obtained at output is larger than other amplifiers. The efficiency of the class C amplifier is larger than the class A, class B and class AB push-pull amplifiers. It mostly used in radio frequency circuitry such as oscillator, radio frequency amplifiers. In theory, the highest efficiency of class C amplifier is almost ninety degrees.ĭue to large signal distortion, this amplifier type is not good for acoustic applications. This operation for less signal increases the efficiency of this amplifier but creates some distortion. Normally its operate for eight to one twenty-degree of a signal. The Class C amplifier Category of amplifier in which transistor operates for a one-eighty degree of the input voltage signal. In today’s tutorial, we will have a look at Introduction to Class C Amplifier. Hello friends, I hope you all are doing great.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |