Article View: sci.electronics
Article #8476Switched Filters
From: erich
Date: Mon, 19 Nov 1990 17:03
Date: Mon, 19 Nov 1990 17:03
32 lines
1198 bytes
1198 bytes
Given some input signal which passes through a high speed switch
and then through a low pass filter.
in ______./ .______/\/\/\_______ out
switch res |
| |cap
| |
|
____
///
If the switch is turned on and off by some control line at a constant
frequency Fsw.
and Fsw >> Fin (input frequency)
and F-3db of Low Pass Filter > Fin
Will Output Signal = Input signal x Duty cycle of control line
with no distortion of the output signal relative to the input
except for attenuation?
Any comments on this type of system would be helpful.
I would simulate it on Pspice but no longer have a copy.
Thanks much...
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!rpi!bu.edu!inmet!erich From: erich@inmet.inmet.com Newsgroups: sci.electronics Subject: Switched Filters Message-ID: <17100009@inmet> Date: 19 Nov 90 17:03:00 GMT Lines: 32 Nf-ID: #N:inmet:17100009:000:803 Nf-From: inmet.inmet.com!erich Nov 19 12:03:00 1990