FM_DEMODULATOR

Published:2009/7/10 6:16:00 Author:May | From:SeekIC

National LM1800 PLL IC accepts composite IF output and converts it to separate audio signals for left and right channels C8 has effect of shunting phase litter to minimize channel separation problems. If free-running frequency of VCO is set at precisely 19kHz with R5, separation remains constant over wide range of composite input levels, signal frequencies, temperature changes, and drift in component values,-“Linear Applications, vol. 2,” National Semiconductor, Santa Clara, CA, 1976, AN-81, p 7-8.



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