Low current drain operational transconductance amplifier
US5598129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 1995 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Aug 24, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/0422
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational transconductance amplifier (500) includes an input stage (502) having a first and second amplifiers (504, 508) driving class-AB, push-pull amplifiers (506, 510). The input stage (502) receives a differential input signal at first and second amplifier inputs (528, 540). The push-pull amplifiers (506, 510) establish differential currents in a transconductance-setting resistor (512), thereby eliminating the need for static current sources. The biasing levels established by the first and second amplifiers (504, 508) to drive the push-pull amplifiers (506, 510) also control a current source (514). Currents from the current source (514) are summed and provided to amplifier outputs (594, 596).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.