Output circuit and method for suppressing switching noise therei

Details Output circuit and method for suppressing switching noise therei Output circuit and method for suppressing switching noise therei

1996-02-05

1998-03-31

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327170, 326 87, H03B 100

Patent

active

057342776

ABSTRACT:
An output circuit (40) includes pull-up transistor (12), two pull-down transistors (14, 16), and a noise suppression circuit (58). When an input node (50) of the output circuit (40) switches to a logic high voltage, the pull-up transistor (12) is switched off. A first transistor (22) in the noise suppression circuit (58) is switched on, discharges a capacitive load (32) coupled to an output node (60) of the output circuit (40), and charges a capacitor formed by a second transistor (24) in the noise suppression circuit (58). After a time delay, the two pull-down transistors (14, 16) are switched on sequentially and establish two current paths from the output node (60) to ground (25). Then, a third transistor (56) in the noise suppression circuit (58) is switched on, discharges the capacitor (24), and establishes a third current path from the output node (60) to ground.

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