Low noise output buffer

Details Low noise output buffer Low noise output buffer

2006-10-31

2006-10-31

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S021000, C327S170000

Reexamination Certificate

active

07129740

ABSTRACT:
The strength of the output buffer is changed gradually when there is a transition in the output (or input) value. Due to the gradual change, switching noise is avoided in several contexts (e.g., when driving a transmission line, which causes reflections). In an embodiment, the gradual change is implemented using a combination of a current source and a capacitor. The capacitor is provided at an input of the gate terminal of a drive transistor, and a current source is used to control the rate at which the capacitor discharges. As a result, the drive strength of a buffer is controlled.

REFERENCES:
patent: 6271699 (2001-08-01), Dowlatabadi
patent: 6617897 (2003-09-01), Lee
patent: 6777974 (2004-08-01), Eichfeld et al.

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