Author Topic: DAC (19kHz + 20kHz) CCIF IMD test  (Read 873 times)

Tranquility Bass

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DAC (19kHz + 20kHz) CCIF IMD test
« on: March 17, 2021, 05:21:22 PM »
Test Methodology:

The configuration is loaded with a twin tone in the signal generator, with two high frequency tones (19kHz + 20kHz) at amplitudes of -7dBFS each, and separated in frequency by 1kHz. The analyzer measuring the first-order difference frequency at 1kHz using a highly-selective FFT-based filter.



Test Results:


Conclusion:

The following test results show that the IMD distortion of the Ultimate Preamplier is exceedingly low and betters the performance of the DEQX Pre-mate by a long margin !






"The only thing necessary for the triumph of evil is for good men to do nothing" -John Stuart Mill,

Tranquility Bass

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2-Channel Direct DAC mode
« Reply #1 on: March 17, 2021, 05:23:39 PM »
 
"The only thing necessary for the triumph of evil is for good men to do nothing" -John Stuart Mill,

Tranquility Bass

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2-Channel Preamplifier Mode using the ASRC
« Reply #2 on: March 17, 2021, 05:24:33 PM »
 
"The only thing necessary for the triumph of evil is for good men to do nothing" -John Stuart Mill,

Tranquility Bass

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IMD vs Ampltude
« Reply #3 on: March 17, 2021, 10:03:41 PM »
"The only thing necessary for the triumph of evil is for good men to do nothing" -John Stuart Mill,

Tranquility Bass

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DEQX PreMate, HF intermodulation spectrum
« Reply #4 on: March 18, 2021, 12:02:10 PM »
Fig.12 DEQX PreMate, HF intermodulation spectrum, DC–30kHz, 19+20kHz at 0dBFS into 100k ohms (left channel blue, right red; linear frequency scale).

Note how the noise floor is lifted up by the two tones whereas this is totally absent in the UP spectrum above ! Again the UP wins hands down !

"The only thing necessary for the triumph of evil is for good men to do nothing" -John Stuart Mill,

 

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