Output impedance circuit and output buffer circuit including...

Details Output impedance circuit and output buffer circuit including... Output impedance circuit and output buffer circuit including...

2006-02-01

2008-12-30

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S030000

Reexamination Certificate

active

07471109

ABSTRACT:
Provided is an output impedance circuit, which has a constant output impedance regardless of a pad voltage, and an output buffer circuit including the output impedance circuit. The output impedance circuit includes an output stage and an impedance control stage. The output stage outputs a current corresponding to a DC bias voltage via an output terminal, and the impedance control stage controls the current flowing through the output stage in response to an output signal. The output stage includes a resistance component and a first MOS transistor. A first terminal of the resistance component is connected to the output terminal. A first terminal of the first MOS transistor is connected to a second terminal of the resistance component, a second terminal of the first MOS transistor is connected to a voltage source, and an input signal is input to a gate of the first MOS transistor.

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patent: 1020020042093 (2002-06-01), None
Office Action for corresponding Korean Application No. 10-2005-0009103 dated May 26, 2006 and English translation thereof.

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