Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1995-05-31
1997-08-19
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324548, 7351432, 73718, 73724, G01R 1152
Patent
active
056592540
ABSTRACT:
A capacitance detector comprises switches for charging and discharging a sensing part, an integrator constituted by a condenser and an operational amplifier for integrating a charging current or a discharging current which is generated according to the charging and discharging the sensing part, a switch for charging an output voltage of the operational amplifier and for feedbacking an electric charge to the integrator, and a condenser. The capacitance detector can be provided by the operational amplifier having a low response performance and a small output current and no hold sample circuit, thereby a circuit scale of the capacitance type sensor can be made small.
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patent: 5166630 (1992-11-01), Lee
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Hanzawa Keiji
Matsumoto Masahiro
Miki Masayuki
Sasayama Takao
Suzuki Masayoshi
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Solis Jose M.
Wieder Kenneth A.
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