Image separation mixer
US5214796A · kind A · utility
32Cited by
14References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1991 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | Mar 29, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/1408
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A mixer (50) separates IF components IF1, IF2 of the same frequency which are images of different frequency RF signals RF1, RF2 beating with a given LO signal, by combining a 180.degree. phase shift input (56) for the LO signal (53) and a 90.degree. phase shift input (66) for the RF signals (63) which are coupled to opposed ports (N1/N2; N3/N4) of a four port diode ring (70) and an output four port quadrature phase shifter (80). The diode ring (70) generates IF signals (71, 72) which are fed to opposed input ports (75, 76) of the output phase shifter (80) at whose other ports (81, 82) the separated image signals IF1, IF2 appear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.