ECI compatible CMOS off-chip driver using feedback to set output

Details ECI compatible CMOS off-chip driver using feedback to set output ECI compatible CMOS off-chip driver using feedback to set output

1992-07-02

1994-01-18

Hudspeth, David R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307473, H03K 19017

Patent

active

052802043

ABSTRACT:
An ECL off-chip driver for CMOS circuits is composed of three sections. The first section is a CMOS inverter stage which receives an inhibit input. The second section is a CMOS AND gate which receives an enable input and the complemented first from the inverter stage. The third stage is itself composed of two stages, a pre-driver stage and an output driver stage. The pre-driver stage includes a CMOS NAND gate and a CMOS NOR gate both of which receive a data input and, respectively, the output and the complemented output of the AND gate. The driver stage includes first and second drive FETs of complementary type connected to an output terminal, said first drive FET being driven by the NAND gate and the second drive FET being driven by the NOR gate. Feedback FETs sense an output signal level and control the first and second drive FETs to produce ECL compatible voltage levels. The feedback FETs are cross-coupled respectively to the NOR and NAND gates to provide added stability in amplitude regulation.

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