Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-08-08
2006-08-08
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S686000
Reexamination Certificate
active
07088112
ABSTRACT:
A capacitor C and an impedance converter Hiz are included in a feedback circuit of the first operational amplifier OP1in series; an electrode P1of a capacitive sensor is connected to a connection point of the said capacitor and the converter via a signal line L. The signal line L is connected to a predetermined standard electric potential through resistance R3whose resistance value is high. When the capacitor is included in the feedback circuit, the signal line becomes in a state of floating and a circuit operation becomes unstable, however, the signal line L is fixed at predetermined electric potential, and therefore, the operation becomes stable. It is acceptable to configure the impedance converter with a voltage follower and connect the resistance R3to the output.
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Deb Anjan
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Natalini Jeff
Tokyo Electron Limited
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