Synthesizer loop filter for scanning receivers

Details Synthesizer loop filter for scanning receivers Synthesizer loop filter for scanning receivers

1991-07-01

1992-09-08

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 16, 331 25, 333174, H03L 7107

Patent

active

051461870

ABSTRACT:
An improved adaptive loop lag filter for phase locked loop frequency synthesizers used in scanning receivers includes an additional resistor controllably inserted into the lag filter by a series-coupled C-MOS switch. The filter can be operated in an intermediate bandwidth mode. Switching to an intermediate bandwidth mode from the wide bandwidth mode before switching to a narrow bandwidth mode reduces the magnitude and duration of disturbances at the VCO output during bandwidth switching and promotes rapid settling of the synthesizer. The improved filter also includes a capacitor coupled between the output of the series-coupled switch and a signal ground to further attenuate any switching transients.

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