Operational amplifier
US4393355A · kind A · utility
3Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Oct 26, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/083
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The gain and phase characteristics of an operational amplifier are improved by adding a system zero to cancel a pole and thereby broadband the amplifier. This is accomplished by simultaneously driving the base terminals of the second stage gain transistor and preceding follower transistor and biasing the circuit such that the dynamic emitter resistance of the follower transistor is much greater than that of the gain transistor and/or by adding an additional emitter impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.