AMFMAND_SWEEP

Published:2009/7/21 3:17:00 Author:Jessie | From:SeekIC

Oscillator and multiplier sections of Exar XR-S200 PLL IC are connected as general-purpose voltage-tuned AM/FM radio-frequency signal generator. Can also serve as high-stability carrier or reference generator if crystal at desired frequency is connected between pins 19 and 20 as shown. Multiplier section introduces amplitude modulation on carrier signal generated by VCO. Balanced multiplier allows suppressed-carrier or double-sideband modulation, Typical carrier suppression is above 40 dB for frequencies up to 10 MHz. With timing capacitor used in place of crystal, oscillator section can provide highly linear FM or frequency sweep. Digital control terminals of oscillator can be used for frequency-shift keying.- Phase-Locked Loop Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 9-16.



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