Common voltage source integrated circuit for liquid crystal...

Details Common voltage source integrated circuit for liquid crystal... Common voltage source integrated circuit for liquid crystal...

2006-06-27

2006-06-27

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

C327S112000, C327S561000

Reexamination Certificate

active

07068092

ABSTRACT:
A common voltage source IC device includes an operational amplifier, a push-pull circuit receiving an output signal from the operational amplifier and outputting a common voltage to a common voltage terminal; an inverting resistor connected to an inverting input of the operational amplifier; a feedback resistor connected to the common voltage terminal and the inverting input; a capacitor connected to the common voltage terminal and the inverting input; a first switching resistor connected to the inverting input and a first switching transistor, the first switching transistor connected to the common voltage terminal; a driving resistor receiving a drive voltage and connected to a non-inverting input of the operational amplifier; a variable resistor connected to the non-inverting input and a ground source; and a second switching resistor connected to the non-inverting input and a second switching transistor, the second switching transistor connected to the ground source.

REFERENCES:
patent: 6677925 (2004-01-01), Kawaguchi et al.
patent: 6756958 (2004-06-01), Furuhashi et al.

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