Logic circuit programmable to implement at least two logic funct

Details Logic circuit programmable to implement at least two logic funct Logic circuit programmable to implement at least two logic funct

1997-03-12

1999-07-13

Tokar, Michael

Electronic digital logic circuitry

Multifunctional or programmable

Field-effect transistor

326119, H03K 19094

Patent

active

059231858

ABSTRACT:
The present invention provides a logic circuit that is programmable to implement a first logic function or a second logic function using as few as four transistors. In one embodiment, the logic circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first signal line for receiving a first input signal, a second signal line for receiving a second input signal, a control signal line for receiving a control signal, and an output signal line for receiving an output signal. The first transistor and the second transistor are connected in series between the control signal line and the output signal line. The third transistor is connected in series between the first input signal line and the output signal line. The fourth transistor is connected in series between the second input signal line and the output signal line. In addition, the first signal line is connected to the gates of the first and fourth transistors, and the second signal line is connected to the gates of the second and third transistors. The state of the control signal provided to the control signal line determines whether the logic circuit implements the first logic function or the second logic function. The first and second logic functions can be (1) an exclusive NOR function or an AND function; or (2) an OR function or an exclusive OR function.

REFERENCES:
patent: 5251169 (1993-10-01), Josephson
patent: 5598115 (1997-01-01), Holst

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