Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1996-04-15
1997-09-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327258, 327256, 327272, H03H 1116
Patent
active
056729910
ABSTRACT:
A signal delay device is provided which enhances noise immunity by using a differential circuit, but also maintains the phase of the input clock signals. This device will also correct the phase of clock signals which are input to the delay device in an out of phase condition. The present invention is a delay circuit that includes functionally connecting each of the output signals with each of the input signals. Thus, the output signals are dependent on the same input and the steady state condition is the point where the leading edge of a first output signal intersects the trailing edge of a second output signal at the point which corresponds to one half of the pulse height of both signals. Since the signals are complements of one another, they will cross at 50% of their pulse height when they are "in phase". Thus, the present invention will maintain "in phase" input signals and seek an "in phase" condition for signals that are input to the delay circuit which are "out of phase".
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Nguyen Trong Duc
Thoma Nandor Gyorgy
Callahan Timothy P.
International Business Machines - Corporation
McBurney Mark E.
Nu Ton My-Trang
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