Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Negative resistance type
Patent
1997-08-22
1998-10-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Negative resistance type
327195, 326134, 257 25, H03K 3315
Patent
active
058252401
ABSTRACT:
Resonant-tunneling transmission lines in the various architectures rely on discrete or continuous resonant-tunneling heterostructures to actively modify propagating logic signals. One embodiment utilizes amplification of logic signals to counteract ubiquitous losses and distortion associated with any transmission medium. Basically, the logic signal is incrementally reamplified and reshaped as it propagates along the transmission line. Another embodiment is directed to a clocking system that transmits a signal represented by a sinusoid. Then, in proximity to the logic gates or modules, the sinusoid is converted into a square wave that actually clocks the gates and other logic structures. The inventive active transmission line naturally performs this feature, thus enabling clock signal transmission over longer links coupled with sinusoid-to-square wave conversion in a limited area. Still other embodiments implement step or continuous variations in the physical width of the resonant-tunneling transmission line. By manipulating the transmission line width of successive sections of the line, isolation in addition to the logic operation of the input signals is achievable in a simple monolithic circuit design. Further embodiments are directed to oscillator circuits and the control of the characteristics of the generated periodic signal.
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Brown Elliott R.
Dennis Christopher L.
Eglash Stephen J.
Geis Michael W.
Callahan Timothy P.
Massachusetts Institute of Technology
Wells Kenneth B.
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