Impedance/admittance measuring circuit

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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1791753R, 324 57Q, G01R 2726

Patent

active

042836751

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).

REFERENCES:
patent: 3283242 (1966-11-01), Oliver
patent: 3284705 (1966-11-01), Dobson
patent: 3612993 (1971-10-01), Tims
Adams, T. M.; Oscillator Circuits; Howard W. Sams & Co., Inc.; Indianapolis, Ind.; 1961; pp. 53-61.
Graeme et al.; Burr Brown Operational Amplifiers . . . Pub. by McGraw-Hill Inc.; l971; pp. 293-295.
Weber, S.; Circuits for Electronics Engineers; McGraw-Hill Pub. Co., New York, NY; 1977; pp. 278-280.

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