Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2011-03-15
2011-03-15
Dole, Timothy J (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C341S142000, C324S519000, C324S663000, C324S658000
Reexamination Certificate
active
07906976
ABSTRACT:
A switched capacitor measurement circuit is provided for measuring the capacitance of an input capacitor with a parallel parasitic resistor. The circuit comprises a switching arrangement, a reference capacitor, a steered current sink and an operational amplifier with an output, a non-inverting input connected to a reference voltage source and an inverting input connected to a first terminal of the input capacitor. The current sink is steered to compensate for a charge current due to the parasitic resistor. Still further, the circuit comprises a digital adder and an analog-to-digital converter with an analog input connected to the output of the operational amplifier and a digital output connected to a first input of the digital adder. A second input of the digital adder receives a negative digital error signal and the output of the digital adder provides a digital capacitance measurement signal corrected for an error current which is integrated across the reference capacitor in the gain mode due to the slewing of the operational amplifier.
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Bernard Binger, authorized officer, International Searching Authority, PCT Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, date of mailing May 20, 2009, International Application No. PCT/EP2008/061764, international filing date Sep. 5, 2008.
Remmers Robert
Vogt John
Baldridge Benjamin M
Brady III Wade J.
Dole Timothy J
Kempler William B.
Telecky , Jr. Frederick J.
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