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Old 1st October 2007, 07:24 AM   #1
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Default About a Nelson Pass phase coherent crossover

Hello

I did found a nice active crossover plan in the document; Phase coherent crossover networks, by Nelson Pass, and it's 2 khz center frequency are righ for me.

I would use the 18 bd / octave schematic.

Is it a butterworth or a bessel type ?

Anybody did a simulation of the summed phase and square wave output on that circuit ?

Thank

Gaetan

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Old 1st October 2007, 01:33 PM   #2
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Here's a sim, the center plot is the summed magnitude or phase:

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Old 1st October 2007, 04:27 PM   #3
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Hello

That's look quite good and phase coherent.

Which simulator did you use ?


Thank you very much

Gaetan
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Old 1st October 2007, 05:47 PM   #4
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Multisim -- now that National Instruments has taken over it doesn't crash and burn -- EWB was a Canadian company I believe.

Here's the 18dB/8vo

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Old 1st October 2007, 10:44 PM   #5
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I should point out that 1 Megohm resistors in the voltage
divider are unrealistically high values for op amps.

Also, it's a lot easier to realize these with ordinary Sallen-Key
filters than with cascaded values of passive components. Just
build the desired filter and use a differential amplifier comparing
the input and output, scaling for gain differences in the pass band.

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