Apparatus for matching impedance in an electrostatic sensor

Details Apparatus for matching impedance in an electrostatic sensor Apparatus for matching impedance in an electrostatic sensor

1993-05-25

1994-06-28

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324681, 324452, 333 32, G01R 2726

Patent

active

053250672

ABSTRACT:
It is an object of the present invention to prevent variations in sensitivity of the sensor circuits of the respective channels by equalizing the power of oscillation frequency signals to be distributed/supplied from one oscillation circuit to the sensor circuits of the respective channels. Multi-channel sensor circuits are arranged with a common oscillation circuit. A high-impedance conversion circuit is connected to the output terminal of the oscillation circuit. A first impedance matching circuit for performing impedance matching of resonance circuits of the respective channels with reference to the oscillation circuit is arranged on the output side of the high-impedance conversion circuit. Second impedance matching circuits for performing impedance matching of the oscillation circuit with reference to the resonance circuits are connected at the input terminals of the resonance circuits of the respective channels. The first impedance matching circuit is connected to the second impedance matching circuits through coaxial cables.

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