Patent ID: 6734741
Filing Date: 2004-05-11
Classification: H03C,H03K,H03L,H04L

Abstract:
The frequency synthesizer, comprising:a digitally controlled oscillator, including a plurality of switchcd capacitors; control circuitry for selectively enabling and disabling said capacitors responsive to an oscillator tuning word, comprising: select circuitry for enabling a number of capacitors responsive to said oscillator tuning word; circuitry for dynamically varying which capacitors are enabled for a given oscillator tuning word to reduce non-linearities caused by slight variances in capacitive values; and a switch matrix coupled to said select circuitry, said dynamically varying circuitry and said plurality of switched capacitors, said switch matrix having a plurality of switches selectively enabled by said select circuitry and said dynamically varying circuitry, said switches for enabling or disabling respective switched capacitors.