Frequency synthesizer for integrated circuit radios

Details Frequency synthesizer for integrated circuit radios Frequency synthesizer for integrated circuit radios

2009-10-31

2011-12-20

Johnson, Ryan (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S034000, C331S014000, C327S156000

Reexamination Certificate

active

08081034

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: 7078946 (2006-07-01), van der Valk et al.
patent: 7405630 (2008-07-01), Jensen
patent: 7616068 (2009-11-01), Anand
patent: 7872535 (2011-01-01), Anand
patent: 2005/0218998 (2005-10-01), Lim

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