Output buffer with reduced noise

Details Output buffer with reduced noise Output buffer with reduced noise

1992-02-12

1994-11-22

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 83, 326122, H03K 19092, H03K 1716

Patent

active

053672100

ABSTRACT:
An output buffer and a method provide controlled low noise operation using a current mirror which provides a rapid increase in the gate voltage of an output transistor prior to the gate voltage reaching the threshold voltage of the output transistor and provide a constant current voltage ramp thereafter. In one embodiment, the present invention automatically compensates for normal variations in transistor channel length due to fluctuations of process parameters. In one embodiment, a mechanism for switching off the current mirror is provided to reduce power consumption.

REFERENCES:
patent: 4634890 (1987-01-01), Lee
patent: 4791322 (1988-12-01), Graham et al.
patent: 4818901 (1989-04-01), Young et al.
patent: 4855624 (1989-08-01), Kertis et al.
patent: 4912745 (1990-03-01), Fitzpatrick et al.
patent: 5065049 (1991-11-01), Jang

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