Variable frequency synthesizer with reduced phase noise
US4602220A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1985 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Aug 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/20
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A reference signal from a reference signal source is supplied to a frequency transformer and a side band signal generator. The frequency transformer is formed mainly by up-converters and produces a frequency m times as high as the frequency f.sub.s of the reference signal. The side band signal generator outputs signals of base and harmonic frequencies f.sub.s, 2f.sub.s, 3f.sub.s, . . . and nf.sub.s (where n is less than m) and produces less phase noise than does the frequency transformer. The outputs of the frequency transformer and the side band signal generator are frequency mixed by a frequency mixer, and one frequency component in the frequency-mixed output is selected by a variable filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.