Frequency correction circuit for a periodic source such as a crystal oscillator
US6359476B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Jun 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B21/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency correction circuit includes a temperature sensor (100) disposed to measure temperature and produce temperature signals representing sensed temperatures. A data supplier (110) stores information items, receives digital input signals representing and produces a digital output information signal representing an item selected in accordance with the digital input signal. A control circuit (120) receives the temperature signals and receives the digital output information signal. The control circuit (120) produces control signals based on the temperature signals. A clock circuit (150) is disposed to generate a reference frequency signal. A digital synthesizer (130) receives the reference frequency signal and the control signals. The digital synthesizer produces an output frequency signal as directed by the control signals received from the control circuit (120).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.