Differential amplifiers with enhanced gain and dynamic range
US7253686B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2005 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Dec 5, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45722
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Differential amplifier embodiments are provided for amplifying input signals with enhanced gain and dynamic range. They include first and second amplifier stages and at least one common-mode feedback circuit that is arranged to mirror and adjust a tail current to control the common-mode level of a respective one of the stages. The stages are configured with cascode elements to obtain high impedances that enhance their signal gain and the common-mode feedback circuit is configured to controllably lower the output voltage of a current source that provides the tail current to thereby enhance the amplifier's dynamic range. The amplifier embodiments are particularly suited for use in applications where they must operate with reduced supply voltages and operate in alternating operational modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.