Multimode frequency synthesizer having high loop gain in frequency seek mode
US5861766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Apr 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1282
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency synthesizer has multiple modes of operation including a relatively short-duration frequency seek mode and a relatively long-duration normal mode. The synthesizer responds to a reference frequency signal and produces a periodic signal at a frequency that is a rational number times the frequency of the reference frequency signal. The synthesizer comprises a VCO, a feedforward state machine, a feedback state machine, a phase comparator, controllable gain circuitry between the phase comparator and the VCO, and logic circuitry that coordinates the operation of the feedforward and feedback state machines during the seek mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.