Buffer apparatus having a low output impedance

Details Buffer apparatus having a low output impedance Buffer apparatus having a low output impedance

1995-08-17

1997-03-11

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 83, 326 85, 326 17, 327170, H03K 190948, H03K 1901, H03K 1908

Patent

active

056105380

ABSTRACT:
A buffer apparatus having a low output impedance includes a first transistor having one terminal coupled to a voltage source, the other terminal coupled to an output terminal of the buffer, and a gate which receives an input signal of the buffer; a second transistor having one terminal coupled to the output terminal of the buffer and a gate which receives the input signal of the buffer; a current sensing circuitry, which is coupled to the other terminal of the second transistor, for sensing a current of the second transistor and amplifying an input current which flows to the second transistor; a voltage driving circuitry, which is formed between the output terminal of the buffer and a ground voltage, for decreasing an output voltage of the buffer by passing the current from the output terminal to the ground voltage according to a control signal which is applied to the voltage driving circuitry.

REFERENCES:
patent: 5027014 (1991-06-01), Bass et al.
patent: 5338987 (1994-08-01), Tomasetti et al.
patent: 5489862 (1996-02-01), Risinger et al.

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