RD30IV - ss fully balanced I/V stage for PCM1704 - diyAudio
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Musicaltech Musicaltech specialize in top digital audio concepts using powerful programmable logic devices. Original designs include total replacement of off-the-shelf chips - seen by the Musicaltech team as a limitation in performance and flexibility. Information about one of the the most sophisticated dacs avaialable for DIYers, either multibit or delta-sigma, are available in the dedicated forum.

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Old 17th September 2012, 04:48 PM   #1
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Default RD30IV - ss fully balanced I/V stage for PCM1704

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
Attached Images
File Type: jpg RD30IV_2.jpg (185.9 KB, 459 views)
File Type: jpg RD30IV_1.jpg (187.5 KB, 437 views)
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Old 17th September 2012, 05:04 PM   #2
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Diagram & dimensions
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File Type: pdf RD30IVdimensions.pdf (42.2 KB, 53 views)
File Type: pdf RD30IVDiagram.pdf (39.5 KB, 133 views)
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Old 27th September 2012, 11:40 AM   #3
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Default Schematics

Schematics of the IV stage
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File Type: pdf RD-30 IV Schematic.pdf (76.0 KB, 231 views)
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Old 22nd October 2012, 12:19 PM   #4
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Default Distortion plot

Attached, distortion plot for a 10 KHz signal, -20 dBFS.
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File Type: jpg RD30IV_distortion.jpg (137.4 KB, 331 views)
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Old 5th November 2012, 08:18 PM   #5
Telstar is offline Telstar  Italy
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very nice. what's the noisefloor of your measuring instrument?
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Old 6th November 2012, 11:53 AM   #6
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Quote:
Originally Posted by Telstar View Post
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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