Leland Stanford Junior University

Zoran Corporation

Codex Corporation

Yigal Brandman

Benjamin C Peterson

Yoseph L Linde

Avinoam Kolodny

Programmable logic gate structures employ pairs of complementary transistors. Programming of the transistors is accomplished either by voltage biasing a shared floating gate of a CMOS transistor pair or by providing a variable resistance serially or in parallel with each transistor. The variable resistance can be a fusible link or a semiconductor device having an alterable crystalline structure.

Programmable complementary transistors

A logic array which is small in size and low in power dissipation uses only one clock signal. The array is fully precharged by precharging a first portion and a second portion and then applying ground to the first portion while delayably applying the ground to the second portion. The address is read into the first portion during the precharging to speed up operation of the array.

High speed fully precharged programmable logic array

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.

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Yigal Brandman