Method and apparatus of an output buffer for controlling the gro

Details Method and apparatus of an output buffer for controlling the gro Method and apparatus of an output buffer for controlling the gro

1998-11-10

2000-12-26

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327387, 327388, 327380, H03K 512, H03K 1716

Patent

active

061665827

ABSTRACT:
A method and apparatus of an output buffer for controlling the ground bounce and power supply noise during output switching is provided. A CMOS output buffer comprises a P-channel output transistor, a N-channel output transistor and a predrive circuit. During output pull-down transition, the predrive circuit generates a first gate voltage on the pull-down N-channel output transistor for a predetermined time, and further generates a second voltage value which is smaller than the first voltage value, then returns to the first voltage value after the elapse of the predetermined time. The predrive circuit makes the pull-down N-channel output transistor stay in the saturation region longer than the uncontrolled scheme, the steep rising gate voltage on the N-channel output transistor can be avoided with a very little speed degradation but instead of better ground bounce improvement. During output pull-up transition, the predrive circuit generates a first gate voltage on the pull-up P-channel output transistor for a predetermined time, and further generates a second voltage which is higher than the first voltage value, then returns back to the first voltage value after the elapse of the predetermined time.

REFERENCES:
patent: 5254890 (1993-10-01), Wang et al.

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