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Well, THAT's Not Gonna Fucking Work!
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<blockquote data-quote="Phil Graham" data-source="post: 39649" data-attributes="member: 430"><p>Re: Well, THAT's Not Gonna Fucking Work!</p><p></p><p></p><p></p><p>Mark,</p><p></p><p>4th order filters are not common for DC blocking. RC conjugate, first order filters are. It is the simplest filter that does the job, and I am sure I could quickly find a dozen schematics with the same version of it. Suddenly I have an overwhelming urge to call Andy Peters out of retirement. :x~:-x~<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite4" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /></p><p></p><p>Even in a magical world where EEs wanted to quadruple their parts count for DC blocking, The filter you posted shows a 4dB magnitude response variation at pi (i.e. 180deg) phase rotation. No surprise here, just what a minium phase HP should do.</p><p></p><p>Bennett shows 180deg of rotation with the barest ripple in magnitude. Do an inverse HBT on the phase of the trace Bennett took would not match the magnitude response.</p><p></p><p>Its not DC blocking...</p></blockquote><p></p>
[QUOTE="Phil Graham, post: 39649, member: 430"] Re: Well, THAT's Not Gonna Fucking Work! Mark, 4th order filters are not common for DC blocking. RC conjugate, first order filters are. It is the simplest filter that does the job, and I am sure I could quickly find a dozen schematics with the same version of it. Suddenly I have an overwhelming urge to call Andy Peters out of retirement. :x~:-x~:mad: Even in a magical world where EEs wanted to quadruple their parts count for DC blocking, The filter you posted shows a 4dB magnitude response variation at pi (i.e. 180deg) phase rotation. No surprise here, just what a minium phase HP should do. Bennett shows 180deg of rotation with the barest ripple in magnitude. Do an inverse HBT on the phase of the trace Bennett took would not match the magnitude response. Its not DC blocking... [/QUOTE]
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Well, THAT's Not Gonna Fucking Work!
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