Amplifier having an output stage with bias current cancellation
US5471174A · kind A · utility
9Cited by
1References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Dec 5, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier circuit (10) receives a differential input signal and provides an amplified differential signal. A converter circuit (14) is responsive to the amplified differential signal and provides a single-ended signal. An output stage (16) is responsive to the single-ended signal for providing an output signal of the amplifier circuit. The output stage provides bias cancellation for the single-ended signal by injecting a current equal to the bias requirement of the input transistors (20, 38). The bias cancellation maintains a high input impedance and high gain and output drive for the output stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.