Fully differential two-stage operational amplifier with gain boosting
US6353361B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2000 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Dec 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45652
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential, two-stage op-amp circuit comprised of a plurality of electrically connected MOSFET's and including a telescopic op-amp circuit integrated with gain-boost amplifier circuits in the input stage and a fully-differential op-amp circuit in the output stage and having very high open-loop DC gain, very high unity-gain frequency, and considerably low power consumption is presented. The gain-boost amplifiers are configured as fully-differential op-amps, one being configured to be electrically connected to PMOS FET circuitry and the other being configured to be electrically connected to NMOS FET circuitry. The input stage op-amp circuit provides high gain, high input resistance, and large common mode rejection. The gain-boost op-amp circuits and the input stage form a local unity-gain feedback, and the outputs of the gain-boost op-amp circuits are adaptively stabilized. The output stage op-amp circuit provides gain, low output resistance, and minimal output loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.