Mixer for direct conversion receiver
US5303417A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1991 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Aug 6, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0047
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mixer system for a direct conversion receiver, the receiver including an RF input path which is divided into I and Q paths for demodulating from the RF signals I and Q signals in phase quadrature with one another, the mixer system including first and second serially coupled mixer means in the I path, third and fourth serially coupled mixer means in the Q path, and a local oscillator providing a plurality of local oscillator signals in phase quadrature with one another to the mixer means, such that the first mixer means receives a local oscillator signal in phase quadrature to the local oscillator signal applied to the second mixer means, and the third mixer means receives a local oscillator in phase quadrature to that applied to the fourth mixer means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.