Amplification device with a bias circuit

Details Amplification device with a bias circuit Amplification device with a bias circuit

2006-10-10

2006-10-10

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

Reexamination Certificate

active

07119622

ABSTRACT:
An operational amplifier amplifies a signal received through its input terminal connected directly to a piezoelectric device. A bias voltage generating section includes a voltage divider between the power supply terminal and the ground terminal. The drain and source of a p-channel MOSFET are connected to the input terminal of the operational amplifier and the ground terminal. Since the voltage divider applies a bias voltage to the gate and the backgate, the p-channel MOSFET maintains the OFF state. Since a drain-backgate parasitic diode clamps the drain potential to the bias voltage, the bias voltage is applied to the input terminal of the operational amplifier. Then, the drain-backgate resistance is extremely high. The p-channel MOSFET is embedded on a substrate together with other circuits of the amplification device. Thus, the amplification device with an extremely high input impedance is configured as a single integrated circuit.

REFERENCES:
patent: 5777518 (1998-07-01), Bailey
patent: 6714081 (2004-03-01), Xu
patent: 01256205 (1989-12-01), None

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