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Title: Transient digitizer with displacement current samplers

A low component count, high speed sample gate, and digitizer architecture using the sample gates is based on use of a signal transmission line, a strobe transmission line and a plurality of sample gates connected to the sample transmission line at a plurality of positions. The sample gates include a strobe pickoff structure near the strobe transmission line which generates a charge displacement current in response to propagation of the strobe signal on the strobe transmission line sufficient to trigger the sample gate. The sample gate comprises a two-diode sampling bridge and is connected to a meandered signal transmission line at one end and to a charge-holding cap at the other. The common cathodes are reverse biased. A voltage step is propagated down the strobe transmission line. As the step propagates past a capacitive pickoff, displacement current i=c(dv/dT), flows into the cathodes, driving the bridge into conduction and thereby charging the charge-holding capacitor to a value related to the signal. A charge amplifier converts the charge on the charge-holding capacitor to an output voltage. The sampler is mounted on a printed circuit board, and the sample transmission line and strobe transmission line comprise coplanar microstrips formed on a surface ofmore » the substrate. Also, the strobe pickoff structure may comprise a planar pad adjacent the strobe transmission line on the printed circuit board.« less
Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
870429
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5519342
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
transient; digitizer; displacement; current; samplers; component; count; speed; sample; gate; architecture; gates; based; signal; transmission; line; strobe; plurality; connected; positions; pickoff; structure; near; generates; charge; response; propagation; sufficient; trigger; comprises; two-diode; sampling; bridge; meandered; charge-holding; cap; common; cathodes; reverse; biased; voltage; step; propagated; propagates; past; capacitive; dt; flows; driving; conduction; charging; capacitor; value; related; amplifier; converts; output; sampler; mounted; printed; circuit; board; comprise; coplanar; microstrips; formed; surface; substrate; planar; pad; adjacent; charge amplifier; component count; displacement current; signal transmission; output voltage; circuit board; transmission line; printed circuit; strobe transmission; sample transmission; reverse biased; sample gate; transient digitizer; capacitive pickoff; amplifier converts; strobe signal; reverse bias; gates connected; speed sample; /327/