Patent ID: 8081034

Claim:
An integrated circuit radio transceiver, comprising: a baseband processor for generating outgoing digital signals and for receiving and processing ingoing digital signals; front-end circuitry for producing outgoing RF based upon the outgoing digital signals and for producing the ingoing digital signals based upon received ingoing RF; and a frequency synthesizer that generates a local oscillation for front-end circuitry operations, comprising first and second capacitive blocks, wherein: at least one of the first and second capacitive blocks comprises a plurality of parallel coupled capacitors; at least one of the plurality of parallel coupled capacitors is selectable; and circuitry for de-coupling and shorting one or more of the parallel coupled capacitors and the first and second capacitive blocks prior to a start of a charging process and for charging and coupling the de-coupled one or more of the parallel coupled capacitors and the first and second capacitive blocks to support charge sharing; and wherein the frequency synthesizer adjusts an output frequency of the frequency synthesizer by adjusting relative periods of the charging and charge sharing of the first and second capacitive blocks.