Analog switching circuit and gradation selector circuit

Details Analog switching circuit and gradation selector circuit Analog switching circuit and gradation selector circuit

2006-05-02

2006-05-02

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

C327S436000, C327S404000

Reexamination Certificate

active

07038525

ABSTRACT:
A gradation selector circuit provided with a resistor string circuit in which resistive elements are connected in series between a high potential power source and a low potential power source and a selector circuit which is connected to the resistor string circuit, which selects one of plural analog voltages generated in the resistor string circuit according to a control signal and which outputs it to an output terminal is used. The selector circuit includes analog switching circuits that select analog voltage close to intermediate potential. The analog switching circuit includes a P-type MOS transistor to the source electrode and the back gate electrode of which the resistor string circuit is connected and a depletion type N-type MOS transistor to the source electrode of which the drain electrode of the P-type MOS transistor is connected and to the drain electrode of which an output terminal is connected.

REFERENCES:
patent: 4529897 (1985-07-01), Suzuki et al.
patent: 4590396 (1986-05-01), Koike
patent: 6348831 (2002-02-01), Baba
patent: S58-171126 (1983-10-01), None
patent: H07-079145 (1995-03-01), None
patent: 2000-77992 (2000-03-01), None

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