Output buffer circuit of IC circuit capable of suppressing power

Details Output buffer circuit of IC circuit capable of suppressing power Output buffer circuit of IC circuit capable of suppressing power

1998-11-24

2000-08-22

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326112, 326 27, 327391, H03K 190175, H03K 19094, H03K 1716

Patent

active

061078336

ABSTRACT:
An output buffer circuit includes an input terminal for inputting an externally supplied signal voltage into the output buffer circuit, a first transistor having a first current path, a first voltage being applied to one end of he first current path, a second transistor having a second current path, one end of the second current path being connected to the other end of the first current path and a second voltage being applied to the other end of the second current path, a first comparing circuit for comparing the signal voltage applied from the input terminal with a voltage appearing across the first transistor and second transistor and subdivided by both the first and second transistors, a second comparing circuit for comparing a reference voltage with the voltage appearing across the first transistor and the second transistor and subdivided by both the first and second transistors, a control circuit for supplying a control signal to control terminals of the first and second transistors based upon comparison results of the first and second comparing circuits so as to control a voltage change in the subdivided voltage between the first and second transistors with respect to the input signal voltage, and an output terminal for outputting a voltage appearing across the first transistor and the second transistor by controlling the voltage change in the subdivided voltage in response to the control signal in the control circuit.

REFERENCES:
patent: 4992677 (1991-02-01), Ishibashi et al.
patent: 5166558 (1992-11-01), Ohsawa
patent: 5598119 (1997-01-01), Thayer et al.
patent: 5666069 (1997-09-01), Gibbs

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