Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1993-06-30
1995-08-22
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327103, 327437, H03K 508, H03K 17687, H03M 1100
Patent
active
054444101
ABSTRACT:
A MOS-based current-switch/driver multiplexed and coupled with a tapped delay line so as to form a generator for transmitting on unshielded, unfiltered transmission lines highly-symmetric data pulses displaying minimal transient aberrations and minimal common-mode noise. The switch/driver is a basic differential current switch incorporating two MOS output transistors controlled by a novel switching means. The novel switching means ensures the symmetry of the output signals by compensating for the turn-on/turn-off asymmetries inherent in MOS transistors. The compensation is provided by the control circuit interposed between the switch/driver inputs and the control gates of the output transistors, a control circuit which includes deliberately-skewed CMOS inverters and a pair of MOS driver-transistors associated with each output transistor. The output signals from these current generators are referenced to ground. Transient aberrations are largely eliminated in this invention by lengthening the rise and fall times of the transmitted pulses. A tapped delay line is used in conjunction with a plurality of the new switch/drivers in order to form and transmit composite pulses with rise/fall significantly greater than the natural rise-times and fall-times of the individual switches (about 0.6 nsec).
REFERENCES:
patent: 3983493 (1976-09-01), Gladstone
patent: 5055720 (1991-10-01), Teede
patent: 5084632 (1992-01-01), Shenbara
patent: 5089728 (1992-02-01), Nguyen
Bohan Thomas L.
National Semiconductor Corporation
Nguyen Tiep H.
Sikes William L.
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