Analog switching circuit device and semiconductor integrated cir

Details Analog switching circuit device and semiconductor integrated cir Analog switching circuit device and semiconductor integrated cir

1997-07-15

1999-04-06

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327544, 327419, 327434, H03K 190175

Patent

active

058923870

ABSTRACT:
In a situation where another analog switching circuit 502 outputs a high potential Vh, this high potential Vh is applied to an output terminal OUT1 of an analog switching circuit 504. When a ground potential is supplied to a node 10 with a changeover switch SW, a diode DD1 falls to an inversely biased state, whereby a potential at a backgate node Nw comes to be approximately equal to the potential Vh. Moreover, a potential approximately equal to the potential Vh is a power source terminal of an NAND gate NAND1, and it is transmitted to an output terminal VGP through an internal circuit, whereby a P channel MOS transistor P1 is turned off. Moreover, the output VGP from an inverter INV5 makes also an N channel MOS transistor N1 turn off. With such a constitution, an unnecessary current is prevented from flowing from a power source potential terminal on a bus line and so on to a ground potential terminal through a parasitic diode, thereby performing full-swinging without lowering an output level.

REFERENCES:
patent: 3866064 (1975-02-01), Gregory et al.
patent: 4611135 (1986-09-01), Nakayama et al.
patent: 5317532 (1994-05-01), Ochii
patent: 5442307 (1995-08-01), Shigehara et al.

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