Charge amplifier

Details Charge amplifier Charge amplifier

2007-09-04

2007-09-04

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S282000

Reexamination Certificate

active

11253802

ABSTRACT:
In a charge amplifier, an operational amplifier is provided. The operational amplifier has an inverting input terminal, a non-inverting input terminal, and an output terminal. An adjustable feedback resistor element is provide to be connected between the inverting terminal and the output terminal. A resistance adjusting circuit is provided to be electrically connected to the adjustable feedback resistor element. The resistance adjusting circuit adjusts the resistance of the adjustable feedback resistor element to a first resistance during a first predetermined period after power-on. The resistance adjusting circuit also adjusts the resistance of the adjustable feedback resistor element to a second resistance after the first predetermined period has elapsed. The second resistance is higher than the first resistance.

REFERENCES:
patent: 6396934 (2002-05-01), Federspiel
patent: 6825717 (2004-11-01), Dettmann
“Single-Chip Surface Micromachined Integrated Gyroscope With 50° /h Allan Deviation” written by John A. Geen et al.; IEEE Journal of Solid-State Circuits, vol. 37, No. 12; Dec. 2002; pp. 1860-1866.

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