Analog power detection for gain control operations
US7013117B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2002 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Dec 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3052
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for dynamically controlling a programmable gain amplifier (PGA) in a radio receiver to provide a plurality of gain steps thereby providing automatic gain control (AGC) in a receiver intermediate frequency (IF) stage comprises an analogy peak detector formed to including a constant current source and a plurality of MOSFETs all configured to produce an output voltage (DC) whose value reflects a peak amplitude of a received differential quadrature phase shift keyed (QPSK) signal. A first circuit portion generates currents that are proportional to the square of the magnitude of the gate to source voltage for each of a plurality of MOSFETs coupled to receive the differential QPSK signal and a second circuit portion produces a voltage that is equal to the square root of the sum of the squares of the currents produced (drawn) by the MOSFETs of the first circuit portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.