Oscillators – Combined with particular output coupling network
Reexamination Certificate
2007-02-27
2007-02-27
Shingleton, Michael B. (Department: 2817)
Oscillators
Combined with particular output coupling network
C331S03600C, C331S016000, C331S1170FE, C331S179000, C331S185000
Reexamination Certificate
active
10964837
ABSTRACT:
A method and apparatus for tuning a VCO circuit to provide desired modulations is described. In one embodiment, the method of the present invention uses a controlled voltage from a digital-to-analog converter to obtain VCO voltage/frequency characteristics. The VCO voltage/frequency characteristics are used to determine a VCO capacitance value as well as a charge pump current level for each frequency band of interest. For one embodiment, the VCO circuit includes a bank of switchable capacitors used to set the VCO capacitance value. The charge pump includes a number of switch-controlled current meters to set the charge pump current level. The VCO capacitors and charge pump current meters are controlled by an off-chip CPU.
REFERENCES:
patent: 5182528 (1993-01-01), Zuta
patent: 5625325 (1997-04-01), Rotzoll et al.
patent: 6366393 (2002-04-01), Feulner et al.
patent: 6512419 (2003-01-01), Adams et al.
patent: 6583675 (2003-06-01), Gomez
patent: 6836192 (2004-12-01), Yang et al.
patent: 0493251 (1992-01-01), None
patent: 2 337 884 (1999-12-01), None
Tsung-Hsien Lin and William J. Kaiser, “A 900MHz, 2.5mA CMOS Frequency Synthesizer with an Automatic, SC Tuning Loop, ” Electrical Engineering Dept., University of California, Los Angeles, IEEE Conference, Orlando, FL, May 21-24, 2000, pp. 375-378.
Cheah Jonathon Y.
Kwek Ee Hong
Lau Chun-Yip Antony
Yang Shih-Tsung
Baker & Botts L.L.P.
Microtune (San Diego) , Inc.
Shingleton Michael B.
LandOfFree
Methods and apparatuses for tuning voltage controlled... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and apparatuses for tuning voltage controlled..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatuses for tuning voltage controlled... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3850335