Phase detector
US5157341A · kind A · utility
8Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Aug 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/087
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase detector for a phase locked loop frequency synthesizer, in which frequency-divided signals from a variable frequency oscillator and a reference oscillator are used to trigger respective ramp waveform generators, and a sample pulse generator is arranged to be responsive to the reference ramp waveform to provide sample pulses centered at the mid-point of that ramp waveform to respective sample and hold circuits, the relative phases of the ramp waveforms being determined from the sampled and held voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.