S-20

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Agoston Agoston wrote this detailed description of what is inside the S-20 that he designed:

I designed that sampler while I worked in TekLabs.

It was shown at the Research Forum interfaced to a SDXX dual channel sampler interface head plugged into the 11801 or CSA803 mainframe.

Feedthrough design BW 30GHz 2mV sensitivity.

4 diode beam lead Schottky diodes on a 5 mil duroid replaceable carrier, coupled to a beam lead SRD based driver also on 5 mil duroid substrate with pins to plug into sockets in the housing. This is all on the side of the lid. The other side of the housing has a polyimide flexible circuit connecting to the 4 pin LEMO connector.

A special flexible differential cable was designed to keep the delay change to 5pS while torqued/twisted 180 degree This cable drives the SRD differentially. The two extra wire provide the sampler bias and send back the average value of the sampled signal.


Abbreviations:

  • SRD: Step Recovery Diode
  • HFCD: High Frequency Components Development. This division under Ken Holland for many years developed the input attenuators for all 7K and 11K scopes, cam switches, Hypcon Connector, 11A52 and 11A72 input attenuators, later the sampling heads.