Offset component cancelation method and circuit
US8461922B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 2011 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Aug 31, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45522
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed for canceling an offset component (e.g., dc component or dc offset) in an amplifier circuit. For example, an apparatus comprises an amplifier circuit with an amplifier element and a feedback resistor network coupled between an output of the amplifier element and an input of the amplifier element. The apparatus also comprises a current source coupled to the feedback resistor network, the current source generating a current signal that generates a voltage in a first portion of the feedback resistor network that cancels an offset component present in an input signal received by the amplifier circuit. A second portion of the feedback resistor network may be adjustable so that a gain applied to the input signal is adjustable while the offset component is canceled from the input signal. One or more resistors in the feedback resistor network may be composed of the same or substantially similar material as one or more resistors associated with the current source. In such case, the voltage generated in the first portion of the feedback resistor network that cancels the offset component present in the input signal received by the amplifier circuit is independent of a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.