Uncompensated and compensated gallium arsenide input receivers

Details Uncompensated and compensated gallium arsenide input receivers Uncompensated and compensated gallium arsenide input receivers

1985-07-26

1987-10-27

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307448, 307475, 307363, 307297, H03K 19094, H03K 1730

Patent

active

047032057

ABSTRACT:
A gallium arsenide input receiver and method modify a conventional voltage level shifter circuit at its input to adapt it to operate on the lower gallium arsenide input voltages. A gallium arsenide depletion common gate amplifier FET receives the lower range of input voltages and turns off when the input signal equals or overcomes its V.sub.p voltage. This causes a pull-up device to apply the full voltage supply to the input of the voltage level shifter circuit, thereby enhancing the input signal voltage level to that originally used for the level shifter circuit. In a second embodiment of voltage compensation circuit is added to compensate for process variations in the V.sub.p voltage for the common gate amplifier FET. Reference voltage is developed by a circuit including a compensating depletion FET having a V.sub.p similar to that of the common gate FET which compensates for changes in the common gate V.sub.p caused by process and temperature variations such that for all receivers on a chip the input signal will optionally see an input V.sub.p of approximately 1.sup.v.

REFERENCES:
patent: 4393315 (1983-07-01), Stickel et al.
patent: 4404480 (1983-09-01), Ransom et al.
patent: 4418291 (1983-11-01), Watson, Jr.
patent: 4450369 (1984-05-01), Schuermeyer
patent: 4494016 (1985-01-01), Ransom et al.
patent: 4590393 (1986-05-01), Ransom et al.

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