Method and apparatus to remove the DC component of a feedback signal
US7944292B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 2008 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Jun 21, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45602
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A feedback circuit disposed across input and output terminals of an amplifier is adapted so as not inject DC current back into the input terminal of the amplifier. The feedback circuit includes, in part, first and second current sources, a transistor, and a resistive load. The first current source supplies current to one of the terminals of the transistor in communication with an input terminal of the amplifier. The second current source receives this current and diverts it to a voltage supply. The transistor is maintained in the active region of operation. The resistive load has a first terminal in communication with an output terminal of the amplifier and a second terminal in communication with the transistor. The DC voltages at the two terminals of the resistive load are substantially equal so as to inhibit DC current flow therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.