Frequency synthesizer
US5781600A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1995 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Oct 20, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L2207/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency synthesizer for producing a tunable frequency output signal. The synthesizer includes a tunable frequency oscillator having a tunable output signal and including: a voltage controlled oscillator (VCO) for generating an output signal; a harmonic generator coupled to the VCO for generating a plurality of harmonics of the VCO output signal; and a tunable bandpass filter coupled to the harmonic generator and having an output for selectively passing any one of the VCO output signal harmonics which constitutes both the tunable output signal of the tunable frequency oscillator and the tunable frequency output signal of the frequency synthesizer. The synthesizer further includes a variable device coupled to the tunable bandpass filter for reducing a frequency of the tunable output signal of the tunable frequency oscillator for generating a reduced frequency output signal; and a phase detector coupled to the variable device for producing an error signal in dependence of a comparison between the reduced frequency output signal and a predetermined reference signal, the phase detector further being coupled to the VCO of the tunable frequency oscillator for creating a phase locked l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.