Center frequency and Q tuning of biquad filter by amplitude-limited oscillation-based calibration
US9673782B1 · kind B1 · utility
5Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2016 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Aug 16, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Certain aspects of the present disclosure provide methods and apparatus for calibrating a tunable active filter. One example apparatus is a filter circuit that generally includes a tunable active filter comprising at least one amplifier and a first feedback path coupled between an input and an output of the at least one amplifier, the first feedback path comprising at least one switch; and an amplitude limiter coupled to the tunable active filter and comprising at least one transistor disposed in a second feedback path coupled between the input and the output of the at least one amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.