Circuit which reduces noise caused by high current outputs

Details Circuit which reduces noise caused by high current outputs Circuit which reduces noise caused by high current outputs

1991-06-28

1993-03-09

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307270, 307469, 307443, H03K 15173, H03K 1716

Patent

active

051928817

ABSTRACT:
Circuitry within a device provides an output signal to an output pad of the device. One of a plurality of current levels is selected. When a first current level is selected, the circuitry generates only a first amount of current to maintain the output signal on the output pad. When a second current level is selected, the circuitry, in addition to the first amount of current, generates a second amount of current to maintain the output signal on the output pad. The first current level may be used in a test mode. In this way high current switching noise can be eliminated during testing. The second current level may then be used in a normal operating mode.

REFERENCES:
patent: 4638187 (1987-01-01), Boler
patent: 4719369 (1988-01-01), Asano et al.
patent: 4855623 (1989-08-01), Flaherty
patent: 4959563 (1990-09-01), Schenck
patent: 5039874 (1991-08-01), Anderson
patent: 5089722 (1992-02-01), Amedeo

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