Operational amplifier with zero offset
US7463087B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 2006 |
| Grant date | Dec 9, 2008 |
| Priority date | — |
| Expiry date | Jan 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45588
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for minimizing a voltage offset between inverting and non-inverting input terminals of an operational amplifier circuit is provided. The circuit includes a chopper circuit connected to the inverting and non-inverting input terminals of the operational amplifier circuit, the chopper circuit including: an amplifier having differential outputs; and a switching circuit for periodically reversing the input terminals to the amplifier and periodically reversing the outputs of the amplifier to provide an output signal having an offset adjustment signal to the operational amplifier circuit to adjust the offset of the operational amplifier circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.