Normalizing circuit with reduced error voltage

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Calibration

Reexamination Certificate

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Reexamination Certificate

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07148700

ABSTRACT:
A circuit for calibrating a voltage signal that includes a first voltage-to-current converter receiving the signal to be calibrated and a reference voltage and providing a current proportional to the voltage difference between the voltage of the signal to be calibrated and the reference voltage, a first current amplifier driven by the first voltage-to-current converter, a second voltage-to-current converter receiving an adjustment voltage and the reference voltage and providing a current proportional to the voltage difference between the adjustment voltage and the reference voltage, a second current amplifier driven by the second voltage-to-current converter, and a circuit for providing a calibrated voltage signal based on the difference between the currents provided by the first and second current amplifiers.

REFERENCES:
patent: 4546327 (1985-10-01), Suzuki et al.
patent: 5050423 (1991-09-01), Czarnocki
patent: 5132559 (1992-07-01), Baskett
patent: 5153529 (1992-10-01), Koda et al.
patent: 5532548 (1996-07-01), Spindt et al.
patent: 0 874 453 (1998-10-01), None
patent: 0 993 110 (2000-04-01), None
May, D., “Notes on an Instrumentation VCA,”Electronic Engineering66(12):18-19, Aug. 1994.

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