Differential amplifier
US4538114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1983 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Sep 1, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45631
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier formed of MISFETs includes a differential amplification stage and a pair of cascade amplification stages which receive outputs from the differential amplification stage. In each of the cascade amplification stages, an amplifying MISFET which receives an input signal at its source has a channel conductivity of opposite type to that of the differential input MISFETs of the differential amplification stage. The differential amplifier with this construction has good frequency characteristics. Since the pair of cascade amplification stages make the currents taken from a pair of outputs from the differential amplification stage equal to each other, the operating balance of the differential amplification stage is not affected. The differential amplifier further includes a feedback circuit which detects the operating points of these cascade amplification stages by referring to the outputs of the cascade amplification stages, and generates a control voltage by comparing the operating points thus detected with a reference potential. The control voltage is fed back to the gates of the amplifying MISFETs in each cascade amplification stage. As a result, the operating p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.