CMOS off-chip driver with reduced signal swing and reduced power

Details CMOS off-chip driver with reduced signal swing and reduced power CMOS off-chip driver with reduced signal swing and reduced power

1991-04-08

1993-04-27

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307453, H03K 1716

Patent

active

052065448

ABSTRACT:
An off-chip driver circuit which includes a complementary pair of field effect transistor source followers connected in a non-inverting series circuit arrangement. The driver circuit includes an n-channel device to pull the output up to the positive supply less the threshold drop across the device and a p-channel device to pull the output down for the opposite transition to within a threshold voltage drop above ground of the p-channel device. The driver circuit includes means for eliminating body effect by connecting the n(p)-well of the p(n) channel transistor to the output node. The driver circuit provides a reduced swing low noise output which reduces the collapse of the power supply. The driver circuit provides an appropriate impedance match to the output transmission line, so that the output transmission line can be terminated to eliminate reflections.

REFERENCES:
patent: 4140930 (1979-02-01), Tanaka
patent: 4322639 (1982-03-01), Yamashiro
patent: 4354151 (1982-10-01), Dingwall
patent: 4654548 (1987-03-01), Tanizawa et al.
patent: 4703201 (1987-10-01), McGrail
patent: 4785201 (1988-11-01), Martinez
patent: 4883979 (1989-11-01), Tran
patent: 5043604 (1991-08-01), Komaki

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