DEMODULATOR USING DIGITAL CIRCUITRY

摘要

A demodulator (3) converts a voltage input "VIN" to an output voltage. The demodulator (3) has a voltage-controlled oscillator (6), a counter (21), a holding apparatus (22). The VCO (6) generates a signal having a frequency proportional to the analog input voltage "VIN". The counter (21) counts each cycle of the signal generated by the VCO (6) and outputs a count signal representative of the cycle count. The holding apparatus (22) holds the count signal and generates a held count signal. The digital compare apparatus (23) compares the count signal and the held count signal and generates the digital output (42).