B170-V: Difference between revisions
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The '''B170-V''' is a 170 Ω attenuator for the [[517]]. | The '''B170-V''' is a 170 Ω attenuator for the [[517]]. | ||
Switches select from 0dB to 64dB of attenuation. | Switches select from 0dB to 64dB of attenuation. | ||
[[John Addis]] wrote: | |||
<blockquote> | |||
The inductors compensate for the switch stray capacitances. When the Ls and | |||
the stray Cs are connected like that, they constitute a lumped element delay | |||
line. The intent is not to make a delay line, but compensate out all the | |||
stray Cs by making a lumped delay line out of it. That extends the | |||
bandwidth and makes the impedance 170 ohms (up to 1 GHz or so) rather than a | |||
bunch of Cs sitting on the connection from input to output. | |||
</blockquote> | |||
<gallery> | <gallery> | ||
Revision as of 21:32, 15 December 2014
The B170-V is a 170 Ω attenuator for the 517. Switches select from 0dB to 64dB of attenuation.
John Addis wrote:
The inductors compensate for the switch stray capacitances. When the Ls and the stray Cs are connected like that, they constitute a lumped element delay line. The intent is not to make a delay line, but compensate out all the stray Cs by making a lumped delay line out of it. That extends the bandwidth and makes the impedance 170 ohms (up to 1 GHz or so) rather than a bunch of Cs sitting on the connection from input to output.
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Hand-trimmed resistors
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Schematic
