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Old 23rd June 2013, 05:24 PM   #41
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Originally Posted by dadod View Post
Yes I was thinking about that one too, or maybe this from Edmond Class i and siblings
Try ODNF error correction, I can supply you info and case study of a similar design using it. It has several advantages over hawksford error correction.

BTW where did you get the idea of the mirror you are using. Dont turn it into a commercial product, a large opamp corporation will sue you for patent infringement .
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Old 23rd June 2013, 06:00 PM   #42
mcd99uk is offline mcd99uk  United Kingdom
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Originally Posted by manso View Post
Try ODNF error correction, I can supply you info and case study of a similar design using it. It has several advantages over hawksford error correction.
Hawksford is ok. I used to like idea but there is complexity, difficulty driving low impedance loads beyond a limit and appears to have difficulty with reactive loads. one caveat, All these views are based on simulation and not real life.

The ODNF info manso talks about is a good read.
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Old 23rd June 2013, 08:04 PM   #43
dadod is online now dadod  Croatia
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Originally Posted by manso View Post
Try ODNF error correction, I can supply you info and case study of a similar design using it. It has several advantages over hawksford error correction.

BTW where did you get the idea of the mirror you are using. Dont turn it into a commercial product, a large opamp corporation will sue you for patent infringement .
Yes please supply the info and case study, I am very interested, heard about ODNF EC but that's all.
I am not interested in comercial product, this is just a hobby. I started with first generation of current conveyor and with the help of some friends here came to present solution. Could you be more precise, what patent you are talking about?
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Old 23rd June 2013, 09:08 PM   #44
RCruz is offline RCruz  Switzerland
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Your initial schematic seems very simple to build....

Would you care to help me debug it if I try it p2p ?

I like the idea of a gain variable amp with constant SN ratio ... you stated first Mirror is very sensitive to load.... does the pot not contribute to variable load ?

PS: I allready have the shunt psu
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Old 24th June 2013, 12:03 AM   #45
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Originally Posted by dadod View Post
Yes please supply the info and case study, I am very interested, heard about ODNF EC but that's all.
I am not interested in comercial product, this is just a hobby. I started with first generation of current conveyor and with the help of some friends here came to present solution. Could you be more precise, what patent you are talking about?
Hi dadod

Drop me your email in a pm and Ill send you the paper.

The part of the circuit Im referring to is only the current mirrors. Basically it consists of the EF mirror and the baxandall cascode. This is protected by US and EU patents, held by texas instruments. I cant recall the number but you can google it. I think its named ultra high output impedance mirrors. Part of the reason for the ultra low THD of tpa6120.

Fortuneatly for diy its no problem.
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Old 24th June 2013, 05:04 AM   #46
dadod is online now dadod  Croatia
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Originally Posted by RCruz View Post
Your initial schematic seems very simple to build....

Would you care to help me debug it if I try it p2p ?

I like the idea of a gain variable amp with constant SN ratio ... you stated first Mirror is very sensitive to load.... does the pot not contribute to variable load ?

PS: I allready have the shunt psu
Yes I will help you and it should be very simple as there is no global feedback. To achieve lowest distortion select current mirrors degeneration resistors to be equal value. It is not imortant to have 0.1% type(better if you can get) but equal resistance. I select with ohmmetter between 1% type.
The mirror is sensitive to capacitive load and off course the gain buffer input inpedance should be high enough not to influence the gain ratio(P1/R9).
BR Damir
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Old 24th June 2013, 10:15 AM   #47
RCruz is offline RCruz  Switzerland
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Cool, I will now start gathering parts and drawing the layout.
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Old 24th June 2013, 10:52 AM   #48
dadod is online now dadod  Croatia
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Cool, I will now start gathering parts and drawing the layout.
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Old 24th June 2013, 11:09 AM   #49
RCruz is offline RCruz  Switzerland
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Would you post the asc files and libs so I can open it on LTSpice ?
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Old 24th June 2013, 11:33 AM   #50
dadod is online now dadod  Croatia
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Originally Posted by RCruz View Post
Would you post the asc files and libs so I can open it on LTSpice ?
It's here
Attached Files
File Type: zip GainWire-mk2-line-phone.zip (7.1 KB, 101 views)
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