Fully digital AGC circuit with wide dynamic range and method of operation
US7031409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Apr 18, 2006 |
| Priority date | — |
| Expiry date | Sep 17, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3809
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital automatic gain control (AGC) circuit for use in a radio frequency (RF) receiver. The AGC circuit comprises: 1) a first shifter for receiving an in-phase signal as a first series of X-bit samples and left-shifting each X-bit sample by a number of bits determined by a coarse scaling factor; 2) a first limiter for receiving the D most significant bits of the output of the first shifter and outputting a subset of the D most significant bits of the first shifter output; 3) a first multiplier for multiplying the subset of the D most significant bits of the first shifter output by a fine scaling factor to produce a first M-bit product; and 4) a gain adjustment circuit for comparing a power signal derived from the first M-bit product to a maximum threshold value and generating the coarse scaling factor and the fine scaling factor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.