Operational amplifier output stage driven by a single ended gain stage
US4409561A · kind A · utility
2Cited by
1References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Apr 13, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/3455
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In an operational amplifier, the output of the differential first stage is applied directly to the base electrode of a voltage gain transistor which in turn drives the remainder of the operational amplifier output stage. A pair of junction field-effect-transistors in conjunction with a diode and a current mirror circuit are employed to set the quiescent voltage at the circuit output. Both pull-up and pull-down transistors are employed to achieve the correct output in response to an input at the base of the voltage gain transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.