Impedance/admittance measuring circuit
US4283675A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1979 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Mar 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An impedance/admittance measuring circuit generates an output signal which is representative of the real or imaginary part of the impedance or admittance of a connected load. An excitation signal comprising a square wave having a fixed magnitude is generated and applied to a load. The response signal resulting from the excitation signal is filtered by a two pole bandpass filter (106). The filter output signal is used to control the excitation signal generator (101, 102) such that an oscillatory feedback loop is formed. By controlling the load connection and the phase relations between the excitation signal and the filter output signal, the magnitude of the output signal is representative of the real or imaginary part of the impedance or admittance of the connected load (103).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.