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-   -   RD30IV - ss fully balanced I/V stage for PCM1704 (http://www.diyaudio.com/forums/musicaltech/219904-rd30iv-ss-fully-balanced-i-v-stage-pcm1704.html)

Lupulroz 17th September 2012 04:48 PM

RD30IV - ss fully balanced I/V stage for PCM1704
 
2 Attachment(s)
With the performance standard set by RD30 itself, the matching I/V stage should perform in the same league. The RD30IV is a transimpedance stage using current steering ; the I/V conversion is actually resistive. It is a fully discrete design, using matched low noise transistor arrays THAT320 and 340 with zero global feedback. Power supply is made with schottky rectifiers and shunt regulators. Only AC power is needed to fire up the board. And a RD30 wouldn’t hurt, too :)

Lupulroz 17th September 2012 05:04 PM

2 Attachment(s)
Diagram & dimensions

Lupulroz 27th September 2012 11:40 AM

Schematics
 
1 Attachment(s)
Schematics of the IV stage

Lupulroz 22nd October 2012 12:19 PM

Distortion plot
 
1 Attachment(s)
Attached, distortion plot for a 10 KHz signal, -20 dBFS.

Telstar 5th November 2012 08:18 PM

very nice. what's the noisefloor of your measuring instrument?

Lupulroz 6th November 2012 11:53 AM

Quote:

Originally Posted by Telstar (Post 3229548)
very nice. what's the noisefloor of your measuring instrument?

This graph shows exactly the noisefloor of an old measurement setup - so it is not relevant - but I cannot delete it :)
The relevant graph is is post 24 from the RD30 dac thread - which shows actual RD30+IV performance.


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