Self-calibrating gain control circuit for low noise amplifier
US6897729B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2004 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Jul 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier comprises a Low Noise Amplifier (LNA) that amplifies a Radio Frequency (RF) signal that includes a transconductance, a gain and an input stage that receives the RF signal. A bias assembly includes a bias circuit with a bias resistance and generates a bias current for the input stage of the LNA, which is related to the bias resistance. A shunt feedback stage amplifies an output of the input stage, generates an RF output and includes a shunt resistance. Changes in the bias resistance due to changes in conditions are substantially offset by changes in the shunt resistance due to the changes in conditions, which reduces variation of the gain of the LNA based on the changes in conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.