FSK_WITH_SLOPEAND_VOLTAGE_DETECTION

Published:2009/7/15 1:43:00 Author:Jessie | From:SeekIC

Motorola MC1545G gated video amplifier is used with slope and differential voltage comparators to provide switching of output alternately between input signal fl at 2975 Hz and f2 at 2125 Hz. With gate level on pin 1 of MC1545G high (greater than 1.5 V), signal applied between pins 4 and 5 is passed and signal between pins 2 and 3 is suppressed. With gate low (less than 0.5 V), situation is reversed. To avoid generation of spurious frequencies and noise, gate control voltage is allowed to change only when rate of change of fl and f2 have same sign and values of fl and f2 themselves have same sign and equal magnitude within several millivolts. Data rate is about 170 Hz.- Gated Video Amplifier Applications-the MC1545, Motorola, Phoenix, AZ, 1976, AN-491, p 12.



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