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{{Plugin Sidebar | |||
|manufacturer=Tektronix | |||
|series=(?) | |||
|type=S-20 | |||
|summary=30 GHz sampling head | |||
|image=Tek s-20.jpg | |||
|caption=Tek S-20 | |||
|introduced=(?) | |||
|discontinued=(?) | |||
|designers=Agoston Agoston | |||
|manuals= | |||
}} | |||
[[Agoston Agoston]] wrote this detailed description of what is inside the S-20 that he designed: | |||
<blockquote> | |||
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 [[Step_recovery_diode|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 [[LEMO_S-series_connector|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. | |||
</blockquote> | |||
[[John Rettig]] wrote this general description: | |||
<blockquote> | |||
As best I can recall – this was never a product, | |||
but a proposal that came out of Tek Labs after the introduction of the [[11800-series_scopes|11800 family of sampling products]]. | |||
It was likely just the [[sampling diodes]] and maybe the front end part of the charge amplifier, | |||
judging by the head size I see in your image link, | |||
and it would have suffered from the modularity of the entire system not having calibrated subcomponents. | |||
Remember that the 11800 was not supposed to need the user to tweak the loop gain, | |||
although that “feature” did sneak its way in to the “Enhanced Accuracy” menus. | |||
We instead productized the [[SD-20]] module in the Lab Scopes HFCD product area, | |||
which essentially was our 20 GHz sampler from the [[SD-23]] / [[SD-24]] designs | |||
but with the 50 Ohm coax fed back out to the front panel instead of having the built in internal 50 Ohm termination on the channel. | |||
And it was fully calibrated, since it didn’t have the modularity of this other proposal. | |||
This device, the SD-20, and for that matter the [[S-6]] of the 7K generation | |||
all suffered from customer inattention to ESD issues - there were a lot of repairs needed. | |||
As a result, our 8000-series never included a loop through feature, | |||
although we do support high BW [[TekConnect_connector|TekConnect]] probes through the [[80A03]]. | |||
And furthermore, all of our samplers now run open loop, | |||
with on-the-fly point correction for the front end nonlinearity, | |||
so there is no loop gain correction needed. | |||
</blockquote> | |||
Abbreviations: | |||
* SRD: [[Step_recovery_diode|Step Recovery Diode]] | |||
* HFCD: High Frequency Components Development. This division under [[Ken Holland]] for many years developed the input attenuators for all [[Main_Page#7000_Series|7K]] and [[:Category:11000_series_scopes|11K]] scopes, [[Cam_switch|cam switches]], [[Hypcon]] Connector, [[11A52]] and [[11A72]] input attenuators, later the sampling heads. | |||
<gallery> | <gallery> | ||
Tek s-20.jpg | Tek s-20.jpg | ||
</gallery> | </gallery> | ||
[[Category:Sampling_plugins]] | |||
[[Category:Prototypes]] |