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Old 6th June 2013, 09:01 PM   #4401
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Quote:
Originally Posted by lhquam View Post
Perhaps these posts are somewhat off-thread, but unless someone suggests a new thread, here they are:

Here are some Spice simulation resulted for the schematic shown in post #4367 F6 Amplifier. The plots are:
  • Harmonics vs. frequency at 1 watt into 8 ohms.
  • Harmonics vs. frequency at 10 watts into 8 ohms.
  • Harmonics vs. power at 1 kHz.
  • Harmonics vs. power at 7 kHz.
Note how H3 remains rather constant vs. frequency and H2 increases nearly linearly with frequency above 1 kHz. If one were to build a bridged ( balanced) amplifier from this in order to cancel most of H2, the result would even more impressive.

I will perform similar simulations without cascoding.
lhquam, of interest are OLG and the attendant power bandwidth.
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Old 6th June 2013, 09:07 PM   #4402
lhquam is offline lhquam  United States
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Originally Posted by generg View Post
No data lhquam!
Are you asking for numerical tabulations of the harmonics? I was assuming that the plots would be sufficient to see the overall behavior.
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Old 6th June 2013, 09:10 PM   #4403
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Old 6th June 2013, 09:19 PM   #4404
lhquam is offline lhquam  United States
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Here are the plots for the cascoded version:
Attached Images
File Type: jpg F6p5-FQA2836-cascode-2-plots.jpg (189.1 KB, 238 views)
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Old 6th June 2013, 09:20 PM   #4405
lhquam is offline lhquam  United States
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And here are the plots for the NON-cascoded version:
Attached Images
File Type: jpg F6p5-FQA2836-plots.jpg (247.0 KB, 227 views)
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Old 6th June 2013, 11:22 PM   #4406
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Quote:
Originally Posted by lhquam View Post
And here are the plots for the NON-cascoded version:
lhquam, is it possible to electronically subtract similar data for the two cases and display the differences?
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Old 7th June 2013, 12:25 AM   #4407
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Quote:
Originally Posted by Antoinel View Post
lhquam, is it possible to electronically subtract similar data for the two cases and display the differences?
Sure, that is possible, but I am not sure how much insight it would provide.
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Old 7th June 2013, 12:43 AM   #4408
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Quote:
Originally Posted by lhquam View Post
And here are the plots for the NON-cascoded version:
cool stuff.... the pass cascode and a75 articles are worth a read here also. Lhquam - what output FET and voltage rails are you using - cannot quite make out from the charts even though im squinting
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Old 7th June 2013, 01:40 AM   #4409
lhquam is offline lhquam  United States
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Quote:
Originally Posted by kasey197 View Post
cool stuff.... the pass cascode and a75 articles are worth a read here also. Lhquam - what output FET and voltage rails are you using - cannot quite make out from the charts even though im squinting
Go back to post #4367 F6 Amplifier.
The output FETs are FQA28N15 and FQA36P15. Rail voltages are 24V.

BTW: The upward bends above 16 watts in the Harmonics-vs-watts plots is due to approaching class B in the cascoded circuit. I should have added some additional wattage values between 16 and 25 watts to show this.
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Old 7th June 2013, 01:47 AM   #4410
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Final pages of 6moons review are up.
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