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S-4: Difference between revisions
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It was designed by [[George Frye]] and [[introduced in 1968]]. | It was designed by [[George Frye]] and [[introduced in 1968]]. | ||
It is the fastest of the S-series plug-in samplers. | It is the fastest of the S-series plug-in samplers. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Rise time | 25 ps (observed with [[S-50]] or [[S-52]] | {{Spec | Rise time | 25 ps (35 ps observed with [[S-50]] or [[S-52]]) }} | ||
{{Spec | Bandwidth | 14.5 GHz }} | {{Spec | Bandwidth | 14.5 GHz }} | ||
{{Spec | Input impedance | 50 Ω (terminated [[SMA connector]])}} | {{Spec | Input impedance | 50 Ω (terminated [[SMA connector]])}} | ||
{{Spec | Input | {{Spec | Input voltage | 1 V<sub>p-p</sub> (operating) }} | ||
{{Spec | Maximum input | | {{Spec | Maximum input | ±5 V max. non-destructive }} | ||
{{Spec | Noise | < 5 mV}} | {{Spec | Noise | < 5 mV}} | ||
{{Spec | Features | | {{Spec | Features | | ||
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This technique requires only a sharp pulse edge rather than a precise pulse width, which is harder to generate. | 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. | The sampling diodes are housed in a special coaxial connector that provides a high bandwidth signal path. | ||
During the development of the S-4, the velocity gate theory was tested using | |||
a length of transmission line between diodes. | |||
This led to an aperture time that depended upon twice the propagation delay of the length of transmission line. | |||
To disassemble the sampler hybrid, first remove it from the sampler board as per the manual. | To disassemble the sampler hybrid, first remove it from the sampler board as per the manual. | ||
Remove the input connector using a 7/32" wrench and remove the 20 dB attenuator with small pliers. | Remove the input connector using a 7/32" wrench and remove the 20 dB attenuator with small pliers. | ||
The ceramic board is held to the housing using roll pins that can be pressed out with a 0.030" pin punch. | The ceramic board is held to the housing using roll pins that can be pressed out with a 0.030" pin punch. | ||
The hybrid has six diodes, each about 0. | |||
The hybrid has six diodes, each about 0.75 mm². | |||
The cathodes are glued to the gold substrate with conductive epoxy and the anodes | The cathodes are glued to the gold substrate with conductive epoxy and the anodes | ||
are wire-bonded (twice) over a gap to the next step in the strobe line. | are wire-bonded (twice) over a gap to the next step in the strobe line. | ||
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==Prices== | ==Prices== | ||
1979: $1,435 (~$ | 1979: $1,435 (~$6,000 in 2023 dollars) | ||
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], | According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], annual sales were estimated at 150 units in 1979. | ||
==Links== | ==Links== | ||