- Thread Starter
- #81
Thank you, @GaNMaster, fabulous, have your prototyped it, yet? If no, have you simulated it?
Please provide details and measurements, we will all be looking forward to reading/seeing them :=)
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Axign/AX5689.... Fresh From the Bench: Improving GaN with Digital Control
- Thread starter KL....
- Start date
Please provide details and measurements, we will all be looking forward to reading/seeing them :=)
Roland68
Major Contributor
It eliminates the need for a complete and complex device, which, unlike most amplifiers, can be deducted from the purchase price.
And, as our experience with the A30a and VMV A2 shows, this doesn't compromise on sound quality—quite the opposite.
- Thread Starter
- #84
Thank you, Yes neat as (definitely), note though that the AX5689 internally is a computer (effectively) that receives Digital and Analogue/PFFB inputs, outputs PWM for the utilised ClassD, and does much more, but the loaded Software/Firmware is not simple (although it will probably become easyer/simpler to manage (macro assembled) over time), and it does allow for (much) simpler/smaller Integrated circuits/architectures/implementations.
- Thread Starter
- #85
Thank you, @GaNMaster any details and measurements, available?New
With Innoscience ISG3208EA (capable of up to 5MHz Switching), Infineon CoolGaN (3x3mm package), and others, it would appear that GaN could soon be Chiped, couldn't it?
- Consideration (Future).... once Chiped, with 5MHz Switching/PWM, the LC could be small enough to be incorporated into the Chip (with High QC of LC, Thermal, & Efficiency, perhaps even a (separate) leg for PFFB/Output), couldn't it? Although the L has significant issues within a Chip (Parasitic capacitance, eddy current losses, and cross-coupling, on-chip inductors are more susceptible to external electromagnetic interference and can also cause it themselves), doesn't it, but this would enable a very short PFFB journey to the AX5689 chip (even leg to leg, for GFB/Closed Loop accuracy), wouldn't it?
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- Thread Starter
- #87
Thank you, @GaNMaster, for your consideration, can (a little lower, perhaps -85/90db/THD+N ) <95db/THD+N be considered as (sufficiently so) transparent? For consideration....
- ASR suggest >=95db/THD+N can be considered as Transparent (sufficiently so), is this correct?
- It has been suggested/indicated, re Masking (Effect), that if the Signal is 70db larger than Noise/THD that the Noise/THD will not be audible, is this correct? If yes, then this implys that the Signal/Contrast will not be (sufficiently/audiblely) affected/Masked by Noise/THD, doesn't it? Unfortunately, SNR is a ratio/% rather than db (difference, db is a Quantity/Measure, not Relative/Accumulated), isn't it?
- Consideration, for 20hz-20Khz, if SNR was SND (Signal to Noise Difference/db or SNDD (Signal to Noise/Distortion Difference/db, and the suggested/indicated Masking (Effect) is correct/reasonable, then SND/SNDD could indicate (a Type of, perhaps Contrast) Transparentcy (>=70db), couldn't it?
- With reference to the Signal to Noise/THD Difference (db Relationship), with (appropriate) Measure/Listening/Investigation would/will confirm, wouldn't it?
- Impressions are consistently pointing to Contrast (my Observation) and can be considered as Repeatable Conclusion that requires Investigation, reasonable, isn't it?
Your reply is appreciated, thank you, and look forward to your AX5689 Implementation :=)
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You can just convert one to the other:
Audio Calculators
www.audiosciencereview.com
dB ⇄ THD% works for noise as well
- Thread Starter
- #89
Thank you, yes, but for an amplifyer, SNR is rated at one frequency (usually 1 kHz sine wave), isn't it? That is, an average representation, where the rating represents an average SNR over a frequency range, rather than an instantaneous one, is this correct?You can just convert one to the other:
Audio Calculators
dB ⇄ THD% works for noise as well
- To ask, would you consider that this is sufficient, and all that is necessary, for a Signal, Noise/Distortion, Masking/Contrast Relationship?
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For an SNR measurement, the signal can be anything; it doesn't need to be a 1 kHz sine. But typically, that is what is used for amp measurements. Generally, I think that is enough. Other measurements will give you an idea if something else is wrong anyway.
- Thread Starter
- #92
Thank you @GaNMaster, what would you like to say about what you have shown?
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This is almost ready, it’s on its way to me, I’ll assemble it soon and take measurements.
- Thread Starter
- #94
Thank you @GaNMaster, FABulous :=)
- Thread Starter
- #96
Thank you, @GaNMaster, any further progress?
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