Apparatus and method for removing offset in a gain circuit
US6121831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1999 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | May 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45479
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An offset-removing gain circuit where the detected offset is independent of the gain of the circuit. The gain circuit includes a differential amplifier transfer circuit with an input and a output, an integrator connected to the output of the differential amplifier transfer circuit through a first impedance, and a second impedance connecting an output of the integrator to the input of the differential amplifier. The impedances may include resistors, capacitors or combinations thereof. The circuit may further include a switched capacitor circuit, where a plurality of capacitors are connected between input and output terminals using switches, whereby the capacitance of the switched capacitor circuit is altered by the switches to remove offset at the integrator output without changing the frequency response thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.