| US 7,579,919 B1 | ||
| Method and apparatus for compensating temperature changes in an oscillator-based frequency synthesizer | ||
| Weixun Cao, 10175 McLaren Pl., Cupertino, Calif. 95014 (US) | ||
| Filed on Apr. 25, 2008, as Appl. No. 12/110,249. | ||
| Claims priority of provisional application 60/998813, filed on Oct. 13, 2007. | ||
| Int. Cl. H03C 3/06 (2006.01); H03L 1/00 (2006.01) | ||
| U.S. Cl. 331—176 [331/23; 332/128] | 21 Claims |
| 1. An architecture comprising:
a frequency locked loop operating based on a reference frequency received from a crystal oscillator;
a frequency correction unit producing a digital frequency corrected control word based on a first parameter and a second parameter,
wherein the first parameter is a combination of a fixed frequency control word and an automatic frequency correction word;
and
an interpolation logic producing the second parameter representing a compensation to changes in temperature,
wherein the frequency locked loop produces a timing clock signal when the first parameter is kept constant, or
wherein the frequency locked loop produces a frequency modulated signal when the first parameter is a sequence of bits representing
frequency changes of a modulating signal.
|