Peachtree new GaN-1 all "Digital Amplifier" the future?? (and it's not Class-D)

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#264
TNT said:
The class solely describe the output stage tech - what is before that has no bearing on the class concept.
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No it only says that it is amplifying and that amplifying devices (transistors, usually MOSFETs) operate as electronic switches.
The input is simplified a signal and a triangular wave into a comparator. Out of the comparator comes the PWM signal.
In the all digital input version (That is not class D amplifier as it is not analog) the signal, triangular wave and comparator are digital.
 
#265
georgehifi said:
So in comparsion we have from a digital source direct into the Preachtree amps, 1 x less D to A conversion stage, no global feedback/just local, yet still .0004% distortion which all has to add up to be better for sound quality.
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Hi,
Do you have the relevant link for this stated performance ?
Thanks and regards,
Shadders.
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Just look at the back of them to see what they take into their inputs, as for the mesurement look back in the thread a way and you'll find the links to them, and just to add I missed, was that even without global feedback these amp still have reasonable low output impedance "good damping factor" for bass control still.

BTW GaN (USA) has just been purchased by Infineon (Germany), don't know what that signifies for my SLX shares that mine the raw material for this new technology.

Cheers George
 
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#266
torgeirs said:
No it only says that it is amplifying and that amplifying devices (transistors, usually MOSFETs) operate as electronic switches.
The input is simplified a signal and a triangular wave into a comparator. Out of the comparator comes the PWM signal.
In the all digital input version (That is not class D amplifier as it is not analog) the signal, triangular wave and comparator are digital.
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Sorry, but you are wrong about this.

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#267
georgehifi said:
as for the mesurement look back in the thread a way and you'll find the links to them,
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Hi,
You seem to have quoted the pre-amp output THD when you stated 0.0004% THD in post #249. (this is for the Carina Digital Amp)

Your original post #1 states THD as 0.004%. where, if you were referring to the Carina GaN Integrated Amplifier, has a typo as THD is < 0.04%.

As such, the amplifier best performance is < 0.04% THD.

(source : https://www.peachtreeaudio.com/collections/integrated-amplifiers/products/carina-gan)

Regards,
Shadders.
 
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#268
TNT said:
No it does NOT. here is where you understanding of the standard consumer Class-D amp is WRONG.

No digital conversion inside.

How hard can it be. Nothing digital in a switching amp. Period. Read up on it - but I doubt you arable to digest the tech involved or you would already know.

Here is some popular tech level information I just found from 30 seconds of googling... never heard of the company but they of course get it...

https://www.adam-audio.com/en/technology/pwm/

Read "PULSE WIDTH MODULATION" section George!

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PWM is definitely recognized as a type of digital signal, as is PCM and PDM. All of these types of signals can be represented as ones and zeros, and can be converted on to the other without an analog step. The typical class D amp takes analog sine wave input and turns it to PWM, and the turns it back in to sine wave analog with more voltage/current to run the speakers. If you want to insist that PWM is not digital so the conversion is not a digital conversion, then that just means we're arguing about the exact definition of digital and digital conversion. Adam Audio is making a point that a digital file is not being created and stored anywhere in a class D amp.
 
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#270
No, a number can be used to represent a digital signal. Digital signals are binary. It's all or nothing. There has to be a switching speed so the timing isn't analog either. Everything is represented in discreet values, whether those values are stored as numbers somewhere or not. PWM is a digital signal.
 
#272
I think the controversy lies in the fact that the timing is continuous. So we end up with a sort of in-between type signal, and it is sometimes referred to as a pseudo-analog signal. It's not purely analog because of its on-off nature, but there's no need for a clock controlling the timing, so the timing is essentially analog.
 
#273
stv said:
Don't mix up "digital" with "binary".
Digital data can be expressed in hexadecimal, for example.
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Good point! The encoded signal could also have 6 discreet voltages instead of just on or off. It seems using multiple "on" voltages isn't typically done for transmitting digital signals, even though it seems data density could be higher that way.
 
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#277
georgehifi said:
BTW GaN (USA) has just been purchased by Infineon (Germany), don't know what that signifies for my SLX shares that mine the raw material for this new technology.

Cheers George
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Well firstly, you don't mine Gallium, you mine other things and Gallium has to be extracted from them. Mainly aluminium smelters who do that.

Secondly the audio market volumes are probably 100dB down on the main applications for GaN in RF power systems, LEDs, fibre optic links and other small markets like electric cars and mobile phones.
 
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