S-4: Difference between revisions
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The '''Tektronix S-4''' is a sampling head for 7000- and 3S-series samplers. It was designed by [[George Frye]] and [[introduced in 1968]]. It is the fastest of the S-series plug-in samplers. (An interesting comparison of different sampling heads is found in [http://www.picosecond.com/objects/AN-02a.pdf "AN-3042a, Revision 1, 2/89"].) | The '''Tektronix S-4''' is a sampling head for 7000- and 3S-series samplers. It was designed by [[George Frye]] and [[introduced in 1968]]. It is the fastest of the S-series plug-in samplers. (An interesting comparison of different sampling heads is found in [http://www.picosecond.com/objects/AN-02a.pdf "AN-3042a, Revision 1, 2/89"].) | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Rise time | 25 ps (observed with [[S-50]] or [[S-52]], 35 ps) }} | {{Spec | Rise time | 25 ps (observed with [[S-50]] or [[S-52]], 35 ps) }} | ||
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==Internals== | |||
The S-4 sampling gate is based upon a traveling wave trapped-charge transmission line in which the sampling window is set by the propagation time of a pulse edge through a thick-film transmission line. This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate. | |||
The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path. | |||
==Links== | ==Links== | ||
Revision as of 06:55, 24 October 2014
Template:Plugin Sidebar 2 The Tektronix S-4 is a sampling head for 7000- and 3S-series samplers. It was designed by George Frye and introduced in 1968. It is the fastest of the S-series plug-in samplers. (An interesting comparison of different sampling heads is found in "AN-3042a, Revision 1, 2/89".)
Key Specifications
| Rise time | 25 ps (observed with S-50 or S-52, 35 ps) |
|---|---|
| Bandwidth | 14.5 GHz |
| Input impedance | 50 Ω (terminated SMA port) |
| Input range | operating, 1 Vp-p; max. safe overload, ±5 V |
| Noise | < 5 mV |
| Features |
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Internals
The S-4 sampling gate is based upon a traveling wave trapped-charge transmission line in which the sampling window is set by the propagation time of a pulse edge through a thick-film transmission line. This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate. The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path.
Links
Pictures
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Top view of the S4 plug-in
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Left view
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Right view
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Schematic
