Phase detector for automatically controlling offset current and phase locked loop including the same
US6496077B2 · kind B2 · utility
6Cited by
4References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 19, 2001 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Apr 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/104
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase detector includes a Gilbert block for outputting a signal proportional to a phase difference between first and second input signals to a first output terminal, and a current source for determining a current in the first output terminal. The current source is controlled by a reference current signal. A converter outputs a current to a second output terminal in response to the signal output from the first output terminal. A variable current source varies the current output to the second output terminal. A controller controls the variable current source in response to the first and second input signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.