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High speed transient sampler

Patent ·
OSTI ID:870186
 [1]
  1. Livermore, CA
+ Show Author Affiliations
A high speed sampler comprises a meandered sample transmission line for transmitting an input signal, a straight strobe transmission line for transmitting a strobe signal, and a plurality of sampling gates along the transmission lines. The sampling gates comprise a four terminal diode bridge having a first strobe resistor connected from a first terminal of the bridge to the positive strobe line, a second strobe resistor coupled from the third terminal of the bridge to the negative strobe line, a tap connected to the second terminal of the bridge and to the sample transmission line, and a sample holding capacitor connected to the fourth terminal of the bridge. The resistance of the first and second strobe resistors is much higher than the signal transmission line impedance in the preferred system. This results in a sampling gate which applies a very small load on the sample transmission line and on the strobe generator. The sample holding capacitor is implemented using a smaller capacitor and a larger capacitor isolated from the smaller capacitor by resistance. The high speed sampler of the present invention is also characterized by other optimizations, including transmission line tap compensation, stepped impedance strobe line, a multi-layer physical layout, and unique strobe generator design. A plurality of banks of such samplers are controlled for concatenated or interleaved sample intervals to achieve long sample lengths or short sample spacing.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
Regents of University of California (Oakland, CA)
Patent Number(s):
US 5471162
OSTI ID:
870186
Country of Publication:
United States
Language:
English

References (5)

Monolithic sampling head IC journal January 1990
Sampling for Oscilloscopes and Other RF Systems: Dc Through X-Band journal December 1966
Modeling of the HP-1430A feedthrough wide-band (28-ps) sampling head journal June 1982
Full monolithic sampling head IC conference January 1990
GaAs nonlinear transmission lines for picosecond pulse generation and millimeter-wave sampling journal July 1991

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