error correction in discrete I/V

Onvinyl · 26th July 2008, 08:44 AM

Hi,
I have once seen a discrete I/V converter stage with error correction (hawksford) around the input transistor. I can't remember where and who did it. Can anyone jump in and help?
Rüdiger

Dejak · 26th July 2008, 01:21 PM

Did you mean this?
http://www.essex.ac.uk/DCES/research...0amplifier.pdf

Onvinyl · 26th July 2008, 01:27 PM

That was it! Thanks a lot!
Rüdiger

tiefbassuebertr · 9th January 2012, 12:45 PM

Quote:

Originally Posted by Dejak

Did you mean this?
http://www.essex.ac.uk/DCES/research...0amplifier.pdf

link is death - here the currently link
http://www.essex.ac.uk/csee/research...0amplifier.pdf

SoNic_real_one · 02:38 PM

Interesting is that was published in 2000 when TL074 was the fastest "kid on the block" - 13 V/uS but with noise at 15nV/sqrt Hz and distortion at 0.01% (-80dB) and 3MHz gain bandwidth.

Today we have devices with SR at 20-55 V/uS, noise at 0.9-1.1nV/sqrt Hz and distortion at -114...-120dB and 55-100MHz gain BW. And we don't use R-2R DAC's anymore.

Limiting the rise time at an R-2R DAC output is simple done with just one capacitor across OpAmp feedback.

26th July 2008, 08:44 AM	#1
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	error correction in discrete I/V Hi, I have once seen a discrete I/V converter stage with error correction (hawksford) around the input transistor. I can't remember where and who did it. Can anyone jump in and help? Rüdiger __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

26th July 2008, 01:27 PM	#3
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	That was it! Thanks a lot! Rüdiger __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

9th January 2012, 02:35 PM	#5
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Interesting is that was published in 2000 when TL074 was the fastest "kid on the block" - 13 V/uS but with noise at 15nV/sqrt Hz and distortion at 0.01% (-80dB) and 3MHz gain bandwidth. Today we have devices with SR at 20-55 V/uS, noise at 0.9-1.1nV/sqrt Hz and distortion at -114...-120dB and 55-100MHz gain BW. And we don't use R-2R DAC's anymore. Limiting the rise time at an R-2R DAC output is simple done with just one capacitor across OpAmp feedback. Last edited by SoNic_real_one; 9th January 2012 at 02:38 PM.

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26th July 2008, 01:21 PM	#2
Dejak diyAudio Member Join Date: Dec 2004 Location: Finland	Did you mean this? http://www.essex.ac.uk/DCES/research...0amplifier.pdf

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