High frequency phase detector using FET bridge
US4864254A · kind A · utility
0Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Dec 2, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D13/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase detector includes a bridge of FETs which are simultaneously rendered conductive by pulses of a reference signal having a very small duty cycle. A higher frequency signal, whose phase in relation to the reference signal is to be detected, is supplied to a gate of one of the FETs. A bridge output signal is low pass filtered and differentially amplified to produce a phase detector output signal. The phase detector output signal can be used directly to control the frequency of a voltage controlled oscillator which produces the higher frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.