Low voltage differential amplifier circuit for wide voltage range operation
US7167052B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2004 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | Sep 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45684
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier design and bias control technique of particular applicability for low voltage operation in which the threshold voltage of n-channel differential input transistors is controlled using substrate bias in order to allow a wider range of input signal levels. Further disclosed is a technique for controlling the substrate bias of the input transistors of a differential amplifier based on the level of the output of the amplifier in addition to a differential amplifier circuit capable of low voltage operation in which an additional bias current is introduced that enables the output pull-up current to be increased without increasing the pull-down current, as well as circuitry for optimizing the performance of the differential in both DDR-I and DDR-II operational modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.