Hi all,

I would like to add my 0.02 Euro to this.....

Michael Rigby-Jones wrote:

>>-----Original Message-----
>>From: Scott Dattalo [SMTP:scott@DATTALO.COM]
>>Sent: Friday, February 21, 2003 1:40 PM
>>To:   PICLIST@MITVMA.MIT.EDU
>>Subject:      Re: [EE]:Analog filter design...
>>
>>To achieve 0.01% flatness and 40dB attenuation at 700kHz will require
>>either a Chebychev II or an elliptic filter. The Chebychev type II filters
>>are monotonic in the passband as opposed to Chebychev type I filters
>>(which what most people simply call Chebychev filters) which are monotonic
>>in the stop band.
>>
>>
> I don't know much about the Type 2 Chebyshev, but isn't the phase response
> of an elliptic filter fairly horrible?


Wouldn't that be a Cauer filter if passband and stopband are "to within
....dB" and varying?

IMHO it should be done with C's to GND and parallel resonant circuits
(LC) in series, and it is going to take several stages, especially for
the requirements up to 70 KHz......

Greets Jochen


>
> Mike
>
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