Fast-switching frequency synthesizer

Details Fast-switching frequency synthesizer Fast-switching frequency synthesizer

H - Electricity

03

L

H03L 7/18 (2006.01) H03C 3/09 (2006.01) H03L 7/085 (2006.01) H03L 7/189 (2006.01)

Patent

CA 2049346

2049346 9111852 PCTABS00006 A frequency modulated phase-locked loop frequency synthesizer (100) is switched in frequency by switching the dividing ratio of a frequency divider (133). A control circuit (200) responsive to the switching and to the output of a phase detector (103) provides a presteering voltage (137) to the control input of a VCO (119) to quickly transition it between two frequencies, and also provides a deviation control signal (141) to vary the gain of an amplifier (129) in the modulation input to the VCO (119). The control circuit (200) allows the presteering voltage (137) to track variations in VCO gain and it maintains a constant FM deviation of the VCO (119) by adjusting the deviation control signal (141).

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