Give the specification of power amplifiers

The specifications of different types of power amplifiers are tabulated below- Class-A Power Amplifier (i) Output current flows during the entire cycle of the A.C. input signal. (ii) The operation of the amplifier is restricted to smaller central region of the load line,so that it can operate in the linear region of the load line. (iii) The circuit efficiency […]

Continue Reading

What are the advantages of negative feedback

(i) Highly stabilized gain. (ii) Reduction in non-linear distortion. (iii) Increased bandwidth,i.e.,improved frequency response. (iv) Increased stability of circuit. (v) Less amplitude distortion. (vi) Less frequency distortion and less phase distortion. (vii) Increases input impedance and decreases output impedance. In other words,the input and output impedance and decreases can be modified as required. (viii) Reduces noise and less harmonic distortion. (ix) The transfer gain Af of […]

Continue Reading

Differences between positive feedback and negative feedback

POSITIVE FEEDBACK (i) If the feedback signal (voltage or current) is applied in such a way that it is in phase with the input signal and thus increases it,then it is called a positive feedback. (ii) it is a regenerative or direct feedback. (iii) Positive feedback increases the gain of amplifier. (iv) It produces excessive distortion. (v) […]

Continue Reading