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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
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Below are all of the forum threads, including all the responses to the original posts. wolf80 Post subject: differential low pass filter Unread postPosted: Mon Nov 15, 2004 1:57 pm Offline Captain Joined: Tue Sep 14, 2004 2:46 pm Posts: 5 Location: San Diego, California Hey guys, can anyone explain what a differential low pass filter is used for and how I can design and simulate one? Thank you. _________________ Smile, because you can. Top Profile Guest Post subject: Differential LPF Unread postPosted: Tue Nov 16, 2004 8:17 pm Hi! A differential low pass filter is used on a (usually!) balanced line, to suppress high frequencies and pass low frequencies. For example: your telephone line is a differential (balanced) line; if you wanted for some reason to get rid of all frequencies above 2.8 kHz, you'd use a differential low-pass filter. This would keep the balanced quality of the line so you wouldn't pick up hum. The standard approach is to design a standard LPF, put half of the inductance in each lead: ----mmm--------- |L --- ---C | ------------------- --------mmm------------ |L/2----/ --- ---C |L/2----\ --------mmm------------ Simulation (if you're using SPICE) requires two transformers - built out of coupled inductors if your version of SPICE doesn't provide transformers as a basic block. Good Luck! Posted 11/12/2012 | ||||||
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