Lowpass filter with electronic control of cutoff and resonance
US4404529A · kind A · utility
9Cited by
2References
15Claims
0Family size
Inventors
Key dates
| Filing date | Dec 30, 1980 |
| Grant date | Sep 13, 1983 |
| Priority date | — |
| Expiry date | Dec 30, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/1213
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A lowpass filter circuit having an electronically controllable cutoff frequency and utilizing a feedback current mirror circuit as a variable impedance element. The filter circuit employs low noise, low distortion output circuitry and includes means for electronically controlling resonance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.