Resonant dielectric amplifier frequency response

THE DIELECTRIC VOLTAGE amplifier shown in Fig. 1 utilizes a nonlinear dielectric (ferroelectric) condenser (capacitor) as part of a series-resonant circuit. This circuit is excited by a carrier source whose voltage and frequency are constant. The capacity of the nonlinear condenser (capacitor) is varied by the signal voltage to be amplified. Of course, a change in the capacity alters the tuning of the resonant circuit, and since the carrier frequency is constant, the circulating carrier current in the resonant circuit is modulated by the signal. The voltages appearing across the elements of the circuit likewise will be modulated. If one of these voltages, usually that across the inductance, is demodulated, a voltage output is obtained which, in a properly designed amplifier, has similar waveshape but larger amplitude than the input signal. Thus a voltage gain is realized.