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DEMODULATOR_WITH_CARRIER_DETECT

2017-01-15 14:17  
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DEMODULATOR_WITH_CARRIER_DETECT
Exar XR-567 PLL system is used with XR-215 FM demodulator to detect presence of carrier signal in narrow-band FM demodulation applications where bandwidth is Iessthan 10% of carrierfrequency. Output of XR-567 is used to turn off FM demodulator when no carrier is present, giving squelch action. Circuit will detect presence of carrier up to 500 kHz.- Phase-Locked Loop Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 41-48.