Method and apparatus for frequency stabilization of a down converter
US5046135A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1989 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/26
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed for automatic elimination of frequency instabilities in a receiver frequency converter. Such instabilities result from temperature variations and mechanical vibrations of the local oscillator of a first stage converter. A marker signal is introduced into the first stage down converter mixer and is subjected to the same variations in frequency conversion as is the received signal from an antenna. Intermediate down converted received signals and an intermediate down converted marker signal are received by a second stage converter where such signals are applied to a mixer, the output of which is free of frequency variations introduced by the local oscillator of the first stage converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.