GaAs logic circuit with temperature compensation circuitry

Details GaAs logic circuit with temperature compensation circuitry GaAs logic circuit with temperature compensation circuitry

1995-11-20

1997-12-09

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

326117, H03K 190952

Patent

active

056964536

ABSTRACT:
The invention provides a logic circuit including (a) a load element having ends one of which is electrically connected to a first terminal of a voltage source, and the other to an output terminal, (b) a first enhancement mode FET including a drain electrode electrically connected to the output terminal, a gate electrode connected to an input terminal, and a source electrode connected to a junction, (c) a second enhancement mode FET including a drain electrode electrically connected to the first terminal, a gate electrode connected to the output terminal, and a source electrode connected to the junction, and (d) a depletion mode FET including a drain electrode electrically connected to the junction, a gate electrode connected to a control terminal, and a source electrode connected to a second terminal of the voltage source. The logic circuit ensures sufficient noise margin to temperature variation, resulting in a lower supply voltage. In addition, the logic circuit makes it possible to compensate for a variation in logical threshold value of DC transfer characteristic caused by an increase in temperature.

REFERENCES:
patent: 4789798 (1988-12-01), Lach
patent: 5077494 (1991-12-01), Bowers et al.

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