Continuous mode auto-zero offset amplifier or integrator
US4808942A · kind A · utility
21Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Apr 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/303
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An error signal, i.e., offset, noise or drift, is sampled in an input capacitor at an error sampling interval and held during the amplification interval. During the amplification interval, the signal is amplified offset-free. The circuit has two paths which operate alternately in such a way that the signal path is never interrupted, except for very brief intervals. Each of the two paths includes an operational amplifier, and the offset voltages of the two operational amplifiers are cancelled out automatically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.