Input stage for N-channel junction field effect transistor operational amplifier
US4387309A · kind A · utility
5Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45076
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input stage for an operational amplifier comprises junction field-effect-transistor input devices having common sources and having their drain electrodes coupled to a PNP level shifting arrangement which in turn drives an NPN current mirror circuit. The level shifting arrangement comprises first and second PNP transistors coupled in a common base configuration with their emitters coupled to the drains of the input JFETS. The level shifting transistor are biased on so as always conduct current to the current mirror circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.