LIMITING_PREAMP_FOR_FM

Published:2009/7/13 21:52:00 Author:May | From:SeekIC

All four sections of Motorola MC3401 quad amplifier are used as intelface between high-impedance microphoneand FM modulator to provide preemρhasis response of 6 dB per octave between 300 and 3000 Hz, with 6-dB per octave rolloff beyond. lncludes amplitude limiter to prevent peak deviation of transmitter from exceeding allowed maximum. U1D forms active fillter acting with passive filter following limiter to give low-pass filter having attenuation of at least 12 dB per octave above 3 kHz.-D. Aldridge, An Economical FM Transmitter Voice Processor from a Single IC, Motorola, Phoenix, AZ, 1975. EB-57.



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