Active high Q filter using transistor
US3974399A · kind A · utility
4Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1974 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Dec 27, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a two-terminal active impedance circuit which comprises a transistor having emitter connected to one terminal of the circuit through a resistor, collector and base directly connected to each other, and a capacitor connected between the one terminal and the collector, said base being applied with a bias voltage whereby an imaginary impedance including a negative resistance is provided between the one terminal and other terminal which is connected to the emitter. Active filters having various characteristics are disclosed in which the above impedance circuit are utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.