G - Physics
01
R
324/59
G01R 13/34 (2006.01) H03K 17/92 (2006.01) H03K 19/195 (2006.01)
Patent
CA 1197290
SOLITON SAMPLER Abstract The invention is an all-soliton sampler for accessing very high speed circuits. A soliton is switched in two parallel branches, one including the device under test and the other including a programmable delay line implemented in soliton devices. The outputs of these two branches are used as controls to a soliton comparator which, in turn, controls a Josephson detector gate. This circuit permits a relatively slow rise time external trigger pulse to initiate an extremely narrow sampling pulse. An object of the invention is to reduce the width of the sampling pulse (which is of order 5ps, set by the inductance and capacitance of the pulse generator) in order to decrease jitter, to obtain the fastest trigger pulse possible without generating appreciable crosstalk. In the soliton sampler according to this invention, extremely narrow test-gate trigger signals and sampling pulses (of width A? 1 ps) are generated simultaneously by an external trigger with a relatively long rise time. The addition of an on-chip programmable delay circuit allows high- resolution sampling to be done without appreciable jitter. Problems with crosstalk are alleviated by allowing a long rise time on the external trigger.
433745
Gheewala Tushar R.
Kaplan Steven B.
Barrett B.p.
International Business Machines Corporation
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