Variable gain amplifier circuit, controller of main amplifier and associated control method
US9654074B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 2015 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Oct 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45116
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable gain amplifier circuit comprises a main amplifier, a current sensing circuit, a variable loading and a control amplifier. The main amplifier is configured for amplifying an input signal to generate an output signal. The current sensing circuit is coupled to the main amplifier, and is configured for generating a sensed current related to a current flowing through the main amplifier. The variable loading is coupled to the current mirror via a node, wherein the sensed current flows through the node and the variable loading. The control amplifier is coupled to the node and the main amplifier, and is configured for receiving a control voltage and a voltage of the node to generate an adjustment signal to control a gain of the main amplifier, wherein a resistance of the variable loading has a nonlinear relationship with the control voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.