Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1994-05-16
1996-03-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
327108, 327310, 326 27, H03K 512, H03K 508
Patent
active
054971136
ABSTRACT:
A transmission line driver circuit has active pullup and pulldown N-type field-effect transistors (N-FETs). An input stage employs a group of N-FETs and a group of P-type field-effect transistors (P-FETs) both being dimensioned and configured to yield a variable-slope switching characteristic for both high-to-low and low-to-high signal transitions. In the N-FET group, one N-FET has the same threshold voltage as the pulldown N-FET, is diode-connected, and is also connected in parallel with a substantially smaller N-FET. In the P-FET group, one P-FET is connected in parallel with a substantially smaller P-FET, and receives a buffered version of the output signal. Both the larger N-FET and larger P-FET conduct for only part of the respective signal transition during which they are active, so that each edge has two distinct slopes. The driver circuit also includes a differential amplifier connected in feedback configuration with the pullup N-FET to limit the maximum transmission line voltage.
REFERENCES:
patent: 4859870 (1989-08-01), Wong et al.
patent: 5010256 (1991-04-01), Dickie
patent: 5038058 (1991-08-01), Wang
patent: 5105102 (1992-04-01), Shioda
Callahan Timothy P.
Chen John C.
Harrison David B.
Le Dinh T.
Quantum Corporation
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