Circuit for converting a fully differential amplifier to a single-ended output amplifier
US4720686A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1987 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Jan 14, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45479
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit which converts differential outputs of a fully differential amplifier to a single output using a buffer amplifier is provided. The fully differential amplifier has common-mode feedback provided by a differential feedback stage. An input of the common-mode differential feedback stage is connected to a predetermined one of the differential outputs to maintain the predetermined output at a reference voltage potential. The buffer amplifier uses diffused or well resistors and a single-ended differential amplifier. The buffer amplifier has a balanced structure which minimizes noise and resistor nonlinearity output errors. The circuit also maintains excellent power supply rejection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.