Chopper stabilized amplifiers combining low chopper noise and linear frequency characteristics
US7535295B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2007 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Nov 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45138
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Chopper stabilized amplifiers combining low clock noise and linear frequency characteristics. The chopper stabilized amplifiers are used in offset correction circuitry, with the output of the chopper stabilized amplifiers being integrated by an integrator. The integrator operates on alternate cycles, with a sample and hold circuit sampling the integrator output when the integrator is not integrating, with the output of the sample and hold being coupled to the main amplification path to cancel offset after at least some amplification is achieved. Autozeroing of amplifiers in the offset correction circuitry is also disclosed. The invention is applicable to operational amplifiers and instrumentation amplifiers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.