example1 example2
typical rc-filter values-1
typical rc-filter values-2
rc-filter b059 ohmics
rc-filter b059 gates
measurements dc-500MHz (1 Mohm load)
| problem: real-life
filters have
only a limited working frequency: example1 example2 |
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| Setup showing isolation, supply and cascaded filtering elements to lower interference in a wide frequency range: | ||
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| PI-filters (roomtemp. filters from 10MHz to 10GHz) | ||
| C=1n5 |
specified damping (db, 50ohm load) |
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| Cu-Powder filters:
(cryo-filters from 100MHz to >40GHz) wire through metal tube with
copperpowder |
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| Type:Cu-wire | meas:0.03-0.5GHz | |
| Type:Cu-wire | meas:0.03-2GHz | |
| Type:Cu-wire | meas:0.03-6GHz | |
| Type:Manganine-wire | meas:0.03-2GHz 1.5-3-5meter wire | |
| Type:Manganine-wire | meas:0.1-20GHz | |
| Cupowder grainsize effects | filter as function of grainsize | |
| (sma-in/out) capacitance | filter capacitance versus wire length | |
| (sma-in/out) cutt-of freq | filter curve 0-6GHz versus wire length | |
| Cu-Powder filters on pcboards | ||
| prototype switch junction: |
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| RC-filters (cryo-filters from 10kHz to 500MHz) | ||
| circuit: typical rc-filter values-1 typical rc-filter values-2 rc-filter b059 ohmics rc-filter b059 gates |
damping: 10kHz=3dB 1MHz=50dB 100MHz=35dB 500Mhz=55dB measurements dc-500MHz (1 Mohm load) |
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