Operational amplifier circuit including folded cascode circuit
US6236270A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45398
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The operational amplifier circuit of the present invention includes a first pair of NMOS which receives a first and a second input voltages to respective gate electrodes and has the source electrodes connected in common, a first pair of PMOS whose gate electrodes are connected in common and whose respective source electrodes are connected to respective drain electrodes of the first pair of NMOSs, a second pair of NMOSs whose gate electrodes are connected in common, whose respective source electrodes are connected to respective drain electrodes of the first PMOS, and whose drain electrodes are connected to a current mirror composed of a second pair of PMOS which is based on the first power supply voltage, and another PMOS whose gate electrode is connected to the drain electrode of one of the second pair of NMOS transistor, whose source electrode receives the first power supply voltage, and whose drain electrode is connected to a constant current source composed of another NMOS transistor whose one end is connected to the second power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.