Frequency synthesizer having VCO bias current compensation

Details Frequency synthesizer having VCO bias current compensation Frequency synthesizer having VCO bias current compensation

2005-01-04

2005-01-04

Shingleton, Michael B (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S03600C, C331S185000, C331S016000, C327S156000, C327S157000, C327S159000

Reexamination Certificate

active

06838951

ABSTRACT:
The present invention provides circuitry for maintaining the desired phase noise across the tuning range of a frequency synthesizer by compensating the voltage controlled oscillator (VCO) bias current according to various tuning parameters available within the frequency synthesizer, thereby reducing overall current drain and inductor quality factor requirements. In general, the present invention includes a VCO bias circuit capable of controlling the VCO bias current in response to a control signal provided by additional circuitry based on the operating frequency of the frequency synthesizer. Further, the VCO bias current changes in response to changing the operating frequency of the frequency synthesizer.

REFERENCES:
patent: 5986514 (1999-11-01), Salvi et al.
patent: 471433 (1992-02-01), None
Greenfield et al. “Using Microprocessors and Microcomputers: The 6800 Family” 1981 John Wiley & Sons Inc p. 10.*
Koo, Yido et al., “A Fully Integrated CMOS Frequency Synthesizer With Charge-Averaging Charge Pump and Dual-Path Loop Filter for PCS- and Cellular-CDMA Wireless Systems,” IEEE Journal of Solid-State Circuits, vol. 37, No. 5, May 2002, pp. 536-542.
Koo, Yido et al., “A Fully-Integrated CMOS Frequency Synthesizer with Charge-Averaging Charge Pump and Dual-Path Loop Filter for PCS- and Cellular-CDMA Wireless Systems,” 2001 Symposium on VLSI Circuits Digest of Technical Papers, 2001, pp. 43-46.

Affiliated with

Also associated with

Rating

Frequency synthesizer having VCO bias current compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency synthesizer having VCO bias current compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer having VCO bias current compensation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3390897