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PCM1794A - IV stage example
PCM1794A - IV stage example
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Old 24th March 2018, 12:09 AM   #61
zenelectro is offline zenelectro  Australia
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Quote:
Originally Posted by Koifarm View Post
Complete passive or transformer.

And how is the sound?
The design intent was low measured distortion.
With passive I-V distortion rises above around +-0.2V swing.
I'm not saying it doesn't sound great but it won't meet the original design intent.

T
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Old 24th March 2018, 12:18 AM   #62
zenelectro is offline zenelectro  Australia
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Quote:
Originally Posted by diyralf View Post
Did a few experiments. The measurement is quite good. The corner frequency is pretty outstanding. Is there a better IV stage in the market?

Freq. resp.: 0.06 dB (20Hz..20kHz)
Corner freq.: -3 dB (40kHz), -12 dB/octave
Noise: 1.21 μV (-118.3 dB)
THD (1 kHz): 0.0003%
THD (20 kHz): 0.0004%
Out voltage: +6 dBu (1.55V)
BW: 20kHz
What opamp / circuit values did you use?
Are those THD or THD+N?

The distortion is close to SOTA but 1794 can acheive better noise / DR performance than this if optimised. It looks like you are getting around
122dB DR.

You are making progress though - so well done.

T
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