Logic circuit

Details Logic circuit Logic circuit

1996-08-14

1999-08-24

Santamauro, Jon

Electronic digital logic circuitry

Interface

Current driving

326 17, 326 93, 326 98, 327201, 327222, H03K 19096, H03K 19017, H03K 3286

Patent

active

059429160

ABSTRACT:
A logic circuit has a signal line for transmitting a digital signal as a voltage level and a loop circuit serving as a memory unit for storing the digital signal. Input and output terminals of the loop circuit are connected to the signal line. The loop circuit is a partial circuit having an even number (at least two) of signal inverters each having capacitive input load. At least one of the input and output terminals of the loop circuit is connected to an electric resistor. The loop circuit has a time constant T that is determined by the product RC of the resistance R of the resistor and the intentional and parasitic capacitance C of the signal inverters. The time constant T has a given relationship with the operation frequency of the logic circuit. The resistance R and capacitance C form a low-pass filter. The logic circuit provides different equivalent circuits in high and low frequency regions above and below the cutoff frequency of the low-pass filter. Namely, the logic circuit operates as a static circuit at low speed to surely keep data and as a dynamic circuit at high speed.

REFERENCES:
patent: 3786282 (1974-01-01), Orndorff
patent: 4766334 (1988-08-01), Warner
patent: 5140179 (1992-08-01), Takano
patent: 5311070 (1994-05-01), Dooley
patent: 5525923 (1996-06-01), Bialas, Jr. et al.
patent: 5612632 (1997-03-01), Mahant-Shetti et al.

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