Digital Circuit for Automatic Correction of Oscillatory Circuit Resonance Frequency with Waricaps at a Large Signal

a digital circuit for automatic compensation of the change in varicap capacitance caused by the effect of a large harmonic signal on the varicaps is proposed. The circuit contains an amplitude detector, a microcontroller, a digital-to-analog converter and a voltage inverter. The circuit is universal, capable of working with any type of varicap, and implements the function of dependence of the correction voltage on the amplitude of oscillations on the varicap with high accuracy.