CMOS driver

Details CMOS driver CMOS driver

1998-07-01

2000-10-24

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 83, 326 30, H03K 19003, H03K 1716, H03K 190175, H03K 19094

Patent

active

061373176

ABSTRACT:
A CMOS input/output driver having constant output impedance, the driver comprising a drive pMOSFET and a drive nMOSFET for driving an output node HIGH and LOW, an pMOSFET having a drain coupled to the output node and switchable so that its gate is coupled to the output node when the drive pMOSFET is driving the output node HIGH, and an nMOSFET having a drain coupled to the output node and switchable so that its gate is coupled to the output node when the drive nMOSFET is driving the output node LOW. The betas of the drive pMOSFET, the drive nMOSFET, the pMOSFET, and the nMOSFET are matched so that the output impedance of the drive is approximately independent of the output node voltage.

REFERENCES:
patent: 5391939 (1995-02-01), Nonaka
patent: 5841702 (1998-11-01), Kim

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