Biquadratic basic cell for programmable analog time-continuous filter
US6239653A · kind A · utility
Inventors
Key dates
| Filing date | Dec 3, 1997 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Dec 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/0433
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to an elementary biquadratic cell for programmable time-continuous analog filters. The biquadratic cell is coupled between a first voltage reference and a second voltage reference and has at least one pair of input terminals and first and second pairs of output terminals. The cell includes a pair of half-cells, which half-cells are structurally identical with each other. Each half-cell comprises at least a first transistor coupled between the first and the second voltage reference and having a base terminal connected to a respective one of the input terminals. Each half-cell further comprises second and third transistors coupled between the first and second voltage references. The second transistor has a base terminal connected to the first output terminal of the first pair of output terminals and a collector terminal connected to the first output terminal of the second pair of output terminals. The third transistor has a collector terminal connected to the first output terminal of the first pair of output terminals and a base terminal connected to the second output terminal of the second pair of output terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.