Phase locked loop with capacitive loop filter

Details Phase locked loop with capacitive loop filter Phase locked loop with capacitive loop filter

2011-01-18

2011-01-18

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S00100A, C331S014000, C331S025000, C455S260000

Reexamination Certificate

active

07872535

ABSTRACT:
An integrated circuit radio transceiver and method therefor includes capacitive loop filter with selectable capacitive elements that are operable to adjust a signal level provided to a voltage controlled oscillator to control a frequency of an output signal of the oscillator. A plurality of switches are controlled by logic to define a discharge mode, a charge mode and charge sharing mode in which a plurality of capacitive elements share charge while generating the input voltage to the oscillator.

REFERENCES:
patent: 5170130 (1992-12-01), Ichihara
patent: 5331230 (1994-07-01), Ichihara
patent: 5410195 (1995-04-01), Ichihara
patent: 7405630 (2008-07-01), Jensen
patent: 7616068 (2009-11-01), Anand

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