Circuit with adjustable amplitude and rolloff frequency characteristics
US4545258A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Jul 5, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G5/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electrical circuit provides an output signal having a frequency representative of an input signal which has a fundamental frequency responsive to a parameter. The circuit has an amplifier having an adjustable amplitude response with an input coupled to the input signal and an output for providing the output signal as a function of the input signal. A filter is coupled to the amplifier and to the output signal for at least partially determining the amplitude response of the amplifier. The filter has an adjustable rolloff frequency characteristic. An adjustable impedance is coupled to the filter to adjust the amplitude response of the amplifier and adjust the rolloff frequency characteristic of the filter as a function of the input signal. A controller is coupled to the output signal and provides a control signal for adjusting the adjustable impedance and hence the amplitude response of the amplifier and the rolloff frequency characteristic of the filter as a function of the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.