Peak detector circuit for FM measuring apparatus

摘要

A peak detector circuit comprises a peak detecting diode circuitry for detecting peaks in an input FM demodulated signal, a capacitor connected to the output of the diode circuitry, a first resistor connected in parallel with the capacitor, and an amplifier connected to the output of the diode circuitry and having a high input impedance. A second resistor is connected to the first resistor in parallel therewith through a turn-on/off switch for discharging and subsequently charging the capacitor within a short time in response to detection of decreasing in the level of the input FM demodulated signal.