Method and apparatus for reducing noise in an output buffer

Details Method and apparatus for reducing noise in an output buffer Method and apparatus for reducing noise in an output buffer

1996-12-20

1999-06-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327110, 326 26, 326 27, H03K 1716

Patent

active

059173610

ABSTRACT:
A low-noise output buffer in accordance with the present invention includes pre-driver circuitry coupled to core circuitry of an integrated circuit, output circuitry having a variable drive level that is responsive to the pre-driver output signal and powered by a first power supply, and noise reduction control circuitry coupled to the first power supply. The noise reduction control circuitry is powered by a second power supply which has less noise than the first power supply, and is arranged to develop a control signal that is coupled to the output circuitry to modify the drive level of the output circuitry to counteract noise detected on the first power supply. In some embodiments, the noise reduction control circuitry includes a first transistor and the output circuitry includes a second transistor which are arranged to form a stacked transistor pair.

REFERENCES:
patent: 4988888 (1991-01-01), Hirose et al.
patent: 5214320 (1993-05-01), Truong
patent: 5319260 (1994-06-01), Wanlass
patent: 5414379 (1995-05-01), Kwon
patent: 5426376 (1995-06-01), Wong et al.
patent: 5438277 (1995-08-01), Sharpe-Geisler
patent: 5585740 (1996-12-01), Tipon

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