DAC I/V measurements

Conclusion

What makes it even more remarkable is that it is a "zero-feedback" design with lower THD(+N) than high-specification op amp with feedback. Kudos to @smms73!
The circuit has very high NFB current feedback by the collector of Q19 to the input. The very high gain is due to the impedance of the CCS Q7.
final_2.png

These measurements are very valuable to those who design IV stage.
 
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