Low noise, low distortion, muxable Gilbert mixer signal processing system and method with AGC functionality
US6931083B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2000 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | May 26, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/1491
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A signal processing system and method. The inventive system includes a first circuit for distributing an input signal between two or more channels in a current mode of operation. A second circuit is disposed in each of the channels for processing the input signal and providing an output signal in response thereto. A third circuit is provided to combine the signals output by the processing circuit. A fourth circuit is included for controlling the first and the third circuits. In a specific illustrative embodiment, the system further includes a radio frequency stage for downconverting a received signal and providing the input signal in response thereto. In the specific embodiment, the first circuit includes a mixing circuit. The mixing circuit includes Gilbert cells and circuitry for providing automatic gain control for each of the channels individually. The Gilbert cells and the automatic gain control circuitry are driven by a transconductance amplifier and therefore operate in a current mode. Differential digital automatic gain control signals are provided in response to a channel select signal from a digital control circuit. The inventive circuit provides multiple IF channels whic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.