Multi-input amplifier with improved return loss and mismatch over gain modes
US10469045B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2017 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Aug 31, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/7209
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A signal amplifier having an input impedance that varies over different bias currents, the signal amplifier comprising a compensation stage including a switchable variable resistance configured to provide a targeted adjustment to the input impedance. A signal amplifier comprising: a variable-gain stage configured to provide a plurality of gain levels that result in different input impedance values; and a compensation stage having a switchable variable resistance configured to provide a targeted adjustment to a respective input impedance. a compensation stage having an output coupled to an input of the gain stage, the compensation stage including a plurality of band selection switches coupled to the plurality of input nodes and a plurality of switchable variable resistance branches coupled to the band selection switches, individual switchable variable resistance branches configured to provide a targeted adjustment to a respective input impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.