Common mode voltage extraction circuit
US7570115B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2007 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Sep 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45702
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Consistent with the present invention, there is provided a circuit for extracting a common mode voltage of an input signal. The device may include an operational amplifier having an output, at least one negative input and at least one positive input, a first transistor, and a second transistor. A terminal of the first transistor may be coupled to the output of the operational amplifier. A terminal of the second transistor may be coupled to a terminal of the first transistor and the at least one positive input of the operational amplifier to create a negative feedback loop. The device may further include a common mode output, wherein the negative feedback loop extracts the common mode voltage of the input signal, the common mode voltage of the input signal being output at the common mode output. The device consistent with the present invention may provide the common mode voltage of the input signal without using any resistors, and while only occupying a small die area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.