Common mode stabilization in a fully differential amplifier
US7750737B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2008 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Sep 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45528
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fully differential amplifier circuit provided according to an aspect of the present invention contains a stabilization block to measure the common mode component at the output of an input stage, and to inject a current proportionate to the common mode component into each of a pair of paths forming the output of the input stage to stabilize a feedback loop formed by the input stage, an output stage and a common mode feedback block. In an embodiment, the stabilization block contains a buffer to receive the measured common mode component and to provide a buffered output. The injected current is generated based on the buffered output. Due to the presence of the buffer, the differential loop may not be affected by injection of the additional current, thereby avoiding any distortions in the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.