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No-global-loop amplification
No-global-loop amplification
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Old 4th October 2017, 06:55 PM   #21
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by vzaichenko View Post
Following Pavel's post, I have tested the concept with diamond IPS.

Valery, thank you for checking an idea.
Very good results!

Quote:
Originally Posted by vzaichenko View Post
The cascodes noticeably reduce 2-nd harmonic, improving overall performance, with 3-rd harmonic dominance. This configuration also shows rather good result in terms of IMD.

Cascoded one needs a cascoded current source for keeping overall concept and idea!


Something like this:
IMG_6548.JPG

With high enough caps it will also provide nice soft-start with intrinsic noise filtering.
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Old 6th October 2017, 05:05 PM   #22
vzaichenko is offline vzaichenko  Russian Federation
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No-global-loop amplification
Arrow Diamondstark PA1

OK, here is my simulation with OPS, utilizing one of the known local error correction techniques. Most of the distortion is coming from OPS anyway, however it looks pretty good even close to clipping (100W @ 8 ohm).

I will simulate a few other OPS options and then - live testing will show if the thing is worth all the work done so far
Attached Images
File Type: jpg DIAMONDSTARK_PA_Sch_01.JPG (470.0 KB, 588 views)
File Type: jpg Spectrum_1KHz_20V_RMS.JPG (142.7 KB, 561 views)
File Type: jpg Spectrum_20KHz_20V_RMS.JPG (140.2 KB, 525 views)
File Type: jpg Square-wave_20KHz_57Vpp.JPG (67.9 KB, 516 views)
File Type: jpg xClipping_20KHz.JPG (70.8 KB, 505 views)
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Old 7th October 2017, 09:36 PM   #23
vzaichenko is offline vzaichenko  Russian Federation
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No-global-loop amplification
Arrow Simplestark

Finally - not as sophisticated and accurate as the previous one, but a rather simple one and still promising in terms of the way it's going to sound.

Self-biasing IPS, trimmers for OPS offset and bias settings.
Attached Images
File Type: jpg @Simplestark_1.0_Sch.JPG (290.6 KB, 331 views)
File Type: jpg Spectrum_1KHz_20V_RMS.JPG (129.9 KB, 324 views)
File Type: jpg Spectrum_20KHz_20V_RMS.JPG (146.4 KB, 126 views)
File Type: jpg Square-wave_20KHz_60Vpp.JPG (72.2 KB, 107 views)
File Type: jpg xClipping_20KHz.JPG (78.8 KB, 77 views)
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Old 7th October 2017, 09:40 PM   #24
jwilhelm is offline jwilhelm  Canada
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The distortion specs are 1 or 2 decimal places off what you normally design, but I'm curious what these will sound like!
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Old 7th October 2017, 09:56 PM   #25
vzaichenko is offline vzaichenko  Russian Federation
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No-global-loop amplification
Yes, numbers are not as good, but still decent for no global loop architecture.
I'm trying to find the way to listen to it... still looking for space for the lab
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Old 7th October 2017, 09:59 PM   #26
jan.didden is offline jan.didden  Europe
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Vz, are you aware of Arto Kolinummi's work on a complete non-global fb amplifier as described in his book?

Jan
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Old 8th October 2017, 09:12 PM   #27
alex mm is offline alex mm  Romania
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Just a little help with PCB . I hope no errors . Maybe someone want to try ....
Attached Images
File Type: jpg SIMPLESTARK ALL TOP.jpg (654.1 KB, 220 views)
File Type: jpg simplestark all pic top.jpg (696.1 KB, 218 views)

Last edited by alex mm; 8th October 2017 at 09:21 PM.
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Old 9th October 2017, 03:01 AM   #28
AKSA is offline AKSA  Australia
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Valery,

I really like your amp, and now that Alex MM has done a Tintoretto on your Simplestark, it could become a masterpiece, like the JLH........
Mind you, 12 semis, but very innovative and very good figures for a ZFB amp!

Поздравляем с прибавлением!

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Old 9th October 2017, 03:53 AM   #29
vzaichenko is offline vzaichenko  Russian Federation
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No-global-loop amplification
Quote:
Originally Posted by jan.didden View Post
Vz, are you aware of Arto Kolinummi's work on a complete non-global fb amplifier as described in his book?

Jan
Jan, thank you for the link - right to the point.
I have ordered the book.

Cheers,
Valery
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Old 9th October 2017, 04:05 AM   #30
vzaichenko is offline vzaichenko  Russian Federation
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No-global-loop amplification
Quote:
Originally Posted by alex mm View Post
Just a little help with PCB . I hope no errors . Maybe someone want to try ....
Hi Alex, thanks a lot for this piece of art - great work, as usual

Would you mind to share the gerbers or whatever interchange format, suitable for ordering the boards (this one will go for no-profit DIY purposes only)?
My building abilities are temporary limited, but I will find the way to prototype and test this one

Cheers,
Valery
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