point of the transistor is fixed so as to get the maximum signal swing at the output (neither towards saturation point nor towards cut-off). A load resistance R C is connected in series with the collector circuit to measure the output voltage. The resistance R , R and R E form the biasing and stabilization circuit. The capacitor C allows only the AC signal to pass through.
The emitter bypass capacitor C E provides a low reactance path to the amplified AC signal. The coupling capacitor C C is used to couple one stage of the amplifier with the next stage while constructing multistage amplifiers. V S is the sinusoidal input signal source applied across the base-emitter. The output is taken across the collector-emitter.
Collector current, I C = β b = C Applying Kirchhoff’s voltage law to the output loop, the collector-emitter voltage is given by V V I R CE CC C C ( . ) - - - - - - - - Unit electronics and Communication i) Tank circuit The LC tank circuit consists of an inductance L and a capacitor C connected in parallel as shown in Figure . (b). Whenever energy is supplied to the tank circuit from a DC source, the energy is stored in inductor and capacitor alternatively.
This produces electrical oscillations of definite frequency. ii) Amplifier This is a single stage amplifier which amplifies the weak signal produced by the tank circuit. The required output is supplied by this amplifier. Amplifier Tank circuit Feedback Network