bandpass filter

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Hey great thread! (I've been away*, but I'll be home soon and I'm looking forward to looking at all the spice files.)

Jim, For myself I think about adding a band pass in front of a PLL (or lock

-in) when I run into dynamic range issues. Now most of the time I use a fa irly low Q BP to avoid the phase shift problem if the 'source' frequency dr ifts a bit. (or if the filter drifts some.) But if JL has got a circuit th at keeps the phase shift under control and lets you run at higher Q on the input BP... then that's a potential win. (At least that's what I see.) It is a fairly narrow application though.

Any other uses?

George H.

That's what I suggested early on.

That's the problem. As I analyze it, as Q goes up, the flat range decreases. Q=10 looks good >:-}

Sounds like fun ;-) ...Jim Thompson

Well, I suppose nothing is ever absolutely perfect. But then, I'm an engineer, and you're not.

Bwahahahahahahaha! Larkin, you are SO funny >:-} ...Jim Thompson

Perfection is the enemy of the good.

For some things (like the mileage of a car, the efficiency of a power plant) a 20% improvement is huge. Sometimes some modest engineering, like my filter gadget maybe, can improve some performance by 20:1. It's not unusual for a bad circuit to give up 30 or 40 dB of s/n.

But there's no perfection. Some people here would claim that there's no such thing as a Butterworth filter, since no filter has that exact transfer function. Tedious gits.

Obfuscation. ...Jim Thompson

See...

Newsgroups: alt.binaries.schematics.electronic Subject: Which Output Is With Improved Phase Shift? - WhichOutputIsWithImprovedPhaseShift.pdf Date: Thu, 15 Aug 2013 11:00:21 -0700 Message-ID: ...Jim Thompson