Feedback biasing technique for a stage of an amplifier that uses a feedback control loop having low gain
US7683715B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Sep 16, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/30015
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
According to an aspect of the present invention, a stage of an amplifier contains a positive feedback loop in addition to a negative feedback loop to maintain the bias currents at a desired level in the active components providing the output of the amplifier. The positive feedback loop senses the finite gain (i.e., less than the ideal infinite gain) of the negative feedback loop and compensates for the finite gain. Due to the use of the positive feedback, the duration and extent of deviation of the bias currents from the desired level is reduced, thereby minimizing the distortions in the output of the amplifier. In an embodiment, the stage corresponds to a class AB stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.