High dynamic range compact mixer output stage for a wireless receiver
US7493097B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2005 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Jun 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/14
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mixer is disclosed having an output stage with an amplifier or gain device configured in a feedback loop to maintain a virtual ground at the input to the gain device. The gain device provides significant dynamic range, gain, and the appropriate impedance matching to insure a low noise output signal of a desired magnitude. Use of an amplifying output stage removes the dependence between mixer gain and mixer configuration, such as mixer bias resistor value, while concurrently overcome undesirable flicker noise that results from use of active devices in the mixer bias structure. A stable virtual ground at the mixer output and gain device input provides linearity over frequency. The gain device may comprises an operational amplifier or trans-resistance/trans-conductance device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.