Switched capacitor amplifier circuit and method for operating a switched capacitor amplifier circuit
US7446602B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 2007 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | May 3, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45212
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Provided are a switched capacitor amplifier capable of removing an influence of an offset voltage and a 1/f noise using a simple circuit, and a method of operating the same.According to the present invention, a switched capacitor amplifier having an operational amplifier and switched capacitors includes: a first switched capacitor one terminal of which is connected with a plus (+) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a second switched capacitor one terminal of which is connected with a minus (−) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a third switched capacitor which is inserted between the plus (+) input terminal and a plus (+) output terminal and provided to set an amplification factor in cooperation with the first switched capacitor and store a plus (+) compensation voltage for compensating for an offset, which is applied to the plus (+) input terminal; and a fourth switched capacitor which is inserted between the minus (−) input terminal and a minus (−) output terminal and provided to set an amplification factor in cooperation with the secon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.