Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1997-01-28
1999-08-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327379, 327108, 327388, 327306, 327318, 326 30, H03K 19003
Patent
active
059330414
ABSTRACT:
An improved output driver that minimizes source point reflections when driving a signal on a transmission line by generating a constant source impedance. The improved output driver uses a transistor switching circuit for generating a nearly constant channel impedance when transistor switching circuit is enabled and is not operating in a saturation mode. A switched diode circuit is coupled in parallel to the transistor switching circuit for generating a nearly constant source impedance when a sufficient voltage to bias the switch diode circuit is applied. Control circuitry is coupled to both the transistor switching circuit and to the switched diode circuit for enabling and disabling the transistor switching circuit and the switched diode circuit. By alternatively enabling and disabling the transistor switching circuit and the switched diode circuit the control circuit is able to generate a constant source impedance.
REFERENCES:
patent: 5168176 (1992-12-01), Wanlass
patent: 5332932 (1994-07-01), Runaldue
Khoury Elie Georges
Oh Sung-Hun
Sessions D. C.
Callahan Timothy P.
Le Dinh
Moy Jeffrey D.
VLSI Technology Inc.
Weiss Harry M.
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