Integrated active electronic switched capacitor filter having extremely low sensitivity to variations of the components
US4920325A · kind A · utility
8Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Feb 26, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H19/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The filter comprises four operational amplifiers in cascade, with switched capacitors in series at the input of every amplifier, with fixed capacitors in parallel to two of said amplifiers, with fixed and switched capacitors in parallel to the remaining amplifiers, and with fixed and switched capacitors in common to groups of several amplifiers in cascade. According to the invention, a path of fixed and switched capacitors in parallel connects the input of the filter to the input of the fourth amplifier, and a fixed capacitor connects the input of the filter to the input of the second amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.