Constant gain and self-calibration technique for RF amplifier
US11196388B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2020 |
| Grant date | Dec 7, 2021 |
| Priority date | — |
| Expiry date | Apr 19, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0617
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Radio Frequency (RF) amplifier design with RFIC suffers gain variations from gain variations due to wafer process variations, temperature changes, and supply voltage changes. Three methods are proposed to achieve constant amplifier gain, either through on-chip wafer calibration, or self-calibration. Through automatic adjustment of amplifier bias current, the proposed methods maintain constant amplifier gain over process, temperature, supply voltage variations. Under the proposed Method 1, a constant transconductance Gm with enhanced gain accuracy is maintained via wafer calibration. Under the proposed Method 2, a constant transconductance Gm is maintained by time-domain averaging through different transistors. Under the proposed Method 3, a constant Gm*R or RF gain is maintained considering the impedance of a matching network of the RF amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.