Low distortion compensated field effect transistor (FET) switch

Details Low distortion compensated field effect transistor (FET) switch Low distortion compensated field effect transistor (FET) switch

1998-10-22

2000-09-05

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327434, 327543, H03K 17687

Patent

active

061148970

ABSTRACT:
An electronic switch is disclosed that comprises a switch element and compensation circuitry. The switch element is operable to pass a signal between signal terminals responsive to a voltage applied to its control terminal. The compensation circuitry applies a bias voltage to the control terminal that tracks an average of a voltage at the signal terminals and is offset by a substantially constant voltage magnitude. The bias voltage insures a substantially uniform resistance across the switch element as the signal varies. In one implementation, the switch element is a field effect transistor. Further, in another embodiment, compensation circuitry can be coupled to a backgate of the switch element. In this case, the compensation circuitry can apply a bias voltage to the backgate that tracks an average of the voltage at the signal terminals and is offset by a substantially constant voltage magnitude. The second bias voltage offsets the backgate to back bias the backgate to channel semiconductor junction.

REFERENCES:
patent: 5563545 (1996-10-01), Scheinberg
patent: 5617057 (1997-04-01), Rees et al.
patent: 5714905 (1998-02-01), Galli et al.

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