Constant output common mode voltage of a pre-amplifier circuit
US7683716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2008 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Aug 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45681
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method, apparatus and system of constant output common mode voltage of a pre-amplifier circuit are disclosed. In one embodiment, a system includes a first circuit, a comparator circuit coupled with an output of the first circuit, a pre-amplifier circuit of the comparator circuit, a tracking circuit coupled with a common output location of the pre-amplifier circuit to provide (e.g., source/sink) an additional current to the common output location of the pre-amplifier circuit using an alternate current path in the tracking circuit when an input common mode of the pre-amplifier circuit is beyond a saturation range, and a second circuit of the comparator circuit coupled with the pre-amplifier circuit. A scaled version of a pair of input transistors of a pre-amplifier circuit of the tracking circuit may be created using a scaling factor (‘N’).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.