Variable resistor array and amplifier circuit

Details Variable resistor array and amplifier circuit Variable resistor array and amplifier circuit

2011-01-11

2011-01-11

Nguyen, Khanh V (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S282000

Reexamination Certificate

active

07868694

ABSTRACT:
A variable resistor array adapted to make a resistance value between a first terminal and a second terminal variable, includes a plurality of resistors connected in series, first through nth MOS transistors selectively connected to the resistors, and first through nth switches having one input terminal connected to the source of the ith MOS transistor, another input terminal connected to a predetermined voltage, and an output terminal connected to a back gate of the ith MOS transistor, and connecting either one of the one input terminal and the other input terminal to the output terminal under control of the ith control signal. The ith switch connects the other input terminal to the output terminal, and the ith switch also connects the one input terminal to the output terminal.

REFERENCES:
patent: 6621346 (2003-09-01), Nabicht et al.
patent: 6825718 (2004-11-01), Kang et al.
patent: 7423482 (2008-09-01), Blon
patent: A-11-017470 (1999-01-01), None
patent: A-2007-258784 (2007-10-01), None

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