passive rc-bandpass with 0dB attenuation in the passband
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From: nukeymusic on 2 Aug 2010 10:50 Is it possible to make a passive rc-bandpass filter which has 0dB attenuation in the passband with only 4 components? nukey
From: cassiope on 2 Aug 2010 13:04 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?
From: Jim Thompson on 2 Aug 2010 13:12 On Mon, 2 Aug 2010 10:04:29 -0700 (PDT), cassiope <fpm(a)u.washington.edu> wrote: >passive rc-bandpass filter Key words: passive rc-bandpass filter... an oxymoron, statement and poster :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Postings via gmail, yahoo, hotmail, aioe, uar or googlegroups, and trolls/feeders, are now automatically kill-filed using Agent v6.0 To be white-listed, send request via the E-mail icon on my website
From: Tim Wescott on 2 Aug 2010 13:21 On 08/02/2010 10:12 AM, Jim Thompson wrote: > On Mon, 2 Aug 2010 10:04:29 -0700 (PDT), cassiope > <fpm(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 04/19/05 www.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 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
From: Tim Wescott on 2 Aug 2010 13:23
On 08/02/2010 07:50 AM, nukeymusic wrote: > Is it possible to make a passive rc-bandpass filter which has 0dB > attenuation in the passband with only 4 components? Ask your prof? Review your class notes? There's some passive RC filter with not too many components that actually has a bit of voltage gain. It's usefulness is pretty much limited to winning bets in University bars, but it's out there. I can't even remember if it's bandpass, but if it isn't it may have a bandpass cousin. -- 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 |