Circuit and method for processing an automatic frequency control signal
US6965653B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Nov 15, 2005 |
| Priority date | — |
| Expiry date | May 3, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated demodulator tuning circuit (10, 60) receives differential currents at input terminals (12, 46) and provides an AFC signal at an output terminal (48). The AFC current characteristic has a dead band (72) in the output current generated when the integrated demodulator tuning circuit (10, 60) operates under the condition where the difference between the currents supplied at the input terminals (12 and 46) is at or below a set threshold value. The set threshold value is determined by the relative sizes of the transistors (14, 16 and 20, 36, 38 and 40) that form the current mirrors connected to the input terminals (12, 46).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.