Circuit and method for impedance detection

Details Circuit and method for impedance detection Circuit and method for impedance detection

2006-02-28

2006-02-28

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S076790

Reexamination Certificate

active

07005865

ABSTRACT:
An electrostatic capacitance detection circuit10comprises a DC voltage generator11, an operational amplifier14of which non-inverting input terminal is connected to specific potential, an impedance converter16, a resistance (R1)12connected between the DC voltage generator11and an inverting input terminal of the operational amplifier14, a resistance (R2)13connected between the inverting input terminal of the operational amplifier14and an output terminal of the impedance converter16, and a capacitor15connected between an output terminal of the operational amplifier14and an input terminal of the impedance converter16. A capacitor to be detected17is connected between the input terminal of the impedance converter16and specific potential.

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Supplementary European Search Report, EPO Form 1503 03.82 (P04C04) dated Jun. 14, 2005 (1page).
Annex to the European Search Report, EPO Form P0459 dated Jun. 14, 2005 (1page). For Application No. EP 02 76 7921

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