Programmable logic gate

Details Programmable logic gate Programmable logic gate

1983-11-28

1986-09-02

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307469, H03K 1902, H03K 19094, H03K 19173, H03K 1920

Patent

active

046098305

ABSTRACT:
A programmable logic gate includes first and second complementary field effect transistors having gate terminals connected to receive a first input signal. A first variable resistance is connected in series with the first transistor, and a second variable resistance is connected in parallel with the second transistor. The variable resistances can be fusible links or variable resistance semiconductor devices. By increasing the resistance of the first variable resistance and decreasing the resistance of the second variable resistance, the input signal becomes ineffective in the logic gate. Conversely, by decreasing the resistance of the first variable resistance and increasing the resistance of the second variable resistance, the input signal becomes effective in operation of the logic circuit. In programming the transistors, one transistor is effectively disconnected from the gate and the complementary transistor is effectively shorted.

REFERENCES:
patent: 4140924 (1979-02-01), Oguey et al.
patent: 4157480 (1979-06-01), Edwards
patent: 4399372 (1983-08-01), Tanimoto et al.
patent: 4424456 (1984-01-01), Shiraki et al.
patent: 4495427 (1985-01-01), Cartwright, Jr.
patent: 4546455 (1985-10-01), Iwahashi et al.

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