About a Nelson Pass phase coherent crossover

gaetan8888 · 1st October 2007, 07:24 AM

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

jackinnj · 1st October 2007, 01:33 PM

Here's a sim, the center plot is the summed magnitude or phase:

gaetan8888 · 1st October 2007, 04:27 PM

Hello

That's look quite good and phase coherent.

Which simulator did you use ?

Thank you very much

Gaetan

jackinnj · 1st October 2007, 05:47 PM

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

Nelson Pass · 1st October 2007, 10:44 PM

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.

1st October 2007, 07:24 AM	#1
gaetan8888 diyAudio Member Join Date: Apr 2007	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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1st October 2007, 01:33 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Here's a sim, the center plot is the summed magnitude or phase:

1st October 2007, 04:27 PM	#3
gaetan8888 diyAudio Member Join Date: Apr 2007	Hello That's look quite good and phase coherent. Which simulator did you use ? Thank you very much Gaetan

1st October 2007, 05:47 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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

1st October 2007, 10:44 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	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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