passive rc-bandpass with 0dB attenuation in the passband
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From: miso on 2 Aug 2010 15:54 On Aug 2, 7:50 am, nukeymusic <nukeymu...(a)gmail.com> wrote: > Is it possible to make a passive rc-bandpass filter which has 0dB > attenuation in the passband with only 4 components? > > nukey Can I buy a vowel? Er, make that an inductor....
From: nukeymusic on 2 Aug 2010 16:06 On Aug 2, 7:04 pm, cassiope <f...(a)u.washington.edu> wrote: > On Aug 2, 7:50 am, nukeymusic <nukeymu...(a)gmail.com> wrote: > > > Is it possible to make a passive rc-bandpass filter which has 0dB > > attenuation in the passband with only 4 components? > > > nukey > > How close to 0dB? What sort of Q (bw/f0)? What's the load? exactly 0dB, unloaded, Q to be determined from the other specifications
From: nukeymusic on 2 Aug 2010 16:07 This configuration won't give 0dB in the passband On Aug 2, 7:21 pm, Tim Wescott <t...(a)seemywebsite.com> wrote: > On 08/02/2010 10:12 AM, Jim Thompson wrote: > > > On Mon, 2 Aug 2010 10:04:29 -0700 (PDT), cassiope > > <f...(a)u.washington.edu> wrote: > > >> passive rc-bandpass filter > > > Key words: passive rc-bandpass filter... an oxymoron, statement and > > poster :-) > > It depends on how loose your definition is of "bandpass filter". > > || ___ > Vin o-----||---o--|___|---o-----o Vout > || | | > | | > .-. --- > | | --- > | | | > '-' | > | | > | | > === === > GND GND > (created by AACircuit v1.28.6 beta 04/19/05www.tech-chat.de) > > There's a passive RC bandpass filter for you. It's not a _resonant_ > bandpass filter, by any means, but it has a magnitude response that's > zero at f = 0, rises to some maximum, then falls to zero as the > frequency approaches infinity. > > -- > > Tim Wescott > Wescott Design Serviceshttp://www.wescottdesign.com > > Do you need to implement control loops in software? > "Applied Control Theory for Embedded Systems" was written for you. > See details athttp://www.wescottdesign.com/actfes/actfes.html
From: nukeymusic on 2 Aug 2010 16:08 On Aug 2, 9:54 pm, "m...(a)sushi.com" <m...(a)sushi.com> wrote: > On Aug 2, 7:50 am, nukeymusic <nukeymu...(a)gmail.com> wrote: > > > Is it possible to make a passive rc-bandpass filter which has 0dB > > attenuation in the passband with only 4 components? > > > nukey > > Can I buy a vowel? Er, make that an inductor.... no inductors allowed here
From: Tim Wescott on 2 Aug 2010 16:35
On 08/02/2010 01:06 PM, nukeymusic wrote: > On Aug 2, 7:04 pm, cassiope<f...(a)u.washington.edu> wrote: >> On Aug 2, 7:50 am, nukeymusic<nukeymu...(a)gmail.com> wrote: >> >>> Is it possible to make a passive rc-bandpass filter which has 0dB >>> attenuation in the passband with only 4 components? >> >>> nukey >> >> How close to 0dB? What sort of Q (bw/f0)? What's the load? > > exactly 0dB, unloaded, Q to be determined from the other specifications Q is almost meaningless in this case -- any passive RC bandpass filter is going to have a damping ratio greater than 1, and the various definitions of Q only converge for damping ratios much less than one. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |