Constant gate drive MOS analog switch

Details Constant gate drive MOS analog switch Constant gate drive MOS analog switch

1998-09-08

2000-11-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Parallel controlled paths

327427, 327581, H03K 1762

Patent

active

061540854

ABSTRACT:
A constant gate drive metal-oxide semiconductor ("MOS") analog switch. In one embodiment, the analog switch includes first, second, and third devices, and a level shifter. The first device includes a source coupled to an input terminal, a drain coupled to an output terminal, and a gate. The second device includes a source coupled to the input terminal, a drain, and a gate. The third device includes a source coupled to the drain of the second device, a drain coupled to the output terminal, and a gate. The level shifter includes an input coupled to the drain of the second device and an output coupled to the gates of the first, second, and third devices. The level shifter provides a constant gate drive to the first device, regardless of a signal on the input terminal, resulting in a constant on-resistance of the analog switch. In addition, a constant linearity of on-resistance is achieved by keeping the gate voltage constant with respect to the mid-point of the source and drain voltages.

REFERENCES:
patent: 4467227 (1984-08-01), Lewyn et al.
patent: 4721871 (1988-01-01), Kiji et al.
patent: 4857984 (1989-08-01), Lucas
patent: 5617055 (1997-04-01), Confalonieri et al.

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