>>>mhz class-d amp for hifi audio MCD-6版本详细测试资料图片及组装方法,

timath

这个东西基本原理如何的呢？

my18mmm

英文那个你都看不懂哦？不会吧。发个翻译上来看看

gogowatch

在DIYAUDIO的一个新讨论关于MCD
英文很差，英文好的朋友请援手

很高兴如果我能够帮上忙

晗晗

hobby_gz

一直在关注这个模块，有一些想法

1. 放大率足够大，直接上电位器和两个模块就可以构成合并机
2. 为何不设计6声道（或更多）模块，用于影院
3. 如果设计成插卡式，比如说用类似pci槽作电源输入、信号输入输出、接地，后期设计会更方便

gogowatch

FUMAC兄, 我显丑了, 希望這能對你产品的推廣有些帮助.

dead time will cause Distortion, i cant tell u the dead time about MCD, but i can tell u the Distortion of MCD-6.
0.0035% at 1W 1k
u can get it from the picture of the 1st post of this title.

the Distortion is good enough ?
no, our thinking is just not bad.
u can download some pdf of other class-D that running at 300~400k,
then u will find the answer

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死区是可以导致失真, 我不能告诉你我们的死区时间,但是我们的MCD-6拥有0.0035%(1w 1k)的失真
大家可以和别的d类功放做个详细的对比

dead time will cause Distortion, i can't tell u the dead time about MCD, but i can tell u that the Distortion of MCD-6 is only 0.0035% at 1W 1kHz.

u can get it from the picture of the 1st post of this thread.

You may ask, is the Distortion good enough?
NO, we just think they are not bad.
u can download some pdf of other class-D that running at 300~400k,
then u will find the answer

in the HI end audio , nothing is enough!
some one had told us , 44k sample rate is good enough for CD, but now we can buy a 192khz sample rate CDplayer. fun
perhaps after years, HHHDCD will say hello to us , who knows it .

在HIEND级别的功放,没有任何东西是足够的,
曾经有人告诉我44k的采样频率,可以很好的还原音乐了,但是现在却出现了192k的高采样格式了.谁能预测将来是否有更高的呢.

in the HI end audio, nothing is enough!
We've been told that, 44k sample rate of CD is good enough to reproduce music, but now we can buy a 192khz sample rate CDplayer. fun!  Perhaps after some years, HHHDCD will say hello to us, who knows?

i have told u , running at 1mhz can give us :
very low phase shift at treble. <10DG at 20k
very width frequency respond,0~150kHz(-3db)
very low pwm idel output : 50mV(rms)
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1MHZ的开关频率,可以得到下面这些好处
低相移: 在20k的时候小于10度
更宽的频带,0~150k(-3db)
更低的开关噪音输出, 50mv

I have to tell you, running at 1mhz we can get,

very low phase shift at treble. <10 degree at 20kHz
very wide frequency response,0~150kHz(-3db)
very low switching residue: 50mV(rms)

or u can select running at 300k
high phase shift at treble: >60DG at 20k
nomal frequency respond: 0~30kHz(-3db)
high pwm idle output: 0.8V~1.4V(peak) or higher and higher!
(one of class-d amp give u a 3~6V pwm idle votage at output pin,
i think he found : if he turn the pwm idle votage at a low level ,the phase shift is too large )
u cant balance all this at just 300~400k
----------------
或者你可以选择300~400k的产品
高相移, 20k相移>60度
普通的频率响应, 0~30k -3db 或者45k
非常高的开关噪音输出: 0.8v~1.4v 或者更高
有个国外非常出名的d类功放,竟然达到3~6v的开关噪音输出,
我估计他发现相移太大,从而造成听感变差,所以他宁愿选择低相移而高噪音输出
这个是低频率D类的无可奈何的选择
因为后级滤波器无法很完美的平衡上面各项的关系,只有提高工作频率才能改善

or u can select a product running at 300kHz~400kHz in order to have,

high phase shift at treble: >60 degree at 20k
normal frequency response: 0~30kHz(-3db)
high switching residue: 0.8V~1.4V(peak) or much higher

One of a famous class-d amp give us 3~6V switching residue at the output pin.  I guess the designer found that if he suppressed the switching residue at a low level, the phase shift was too large to be acceptable.  This is a dilemma for a class-d design at relatively low switching frequency.  u can't balance these all at just 300~400k.  You have no choice but to raise the switching frequency at a higher level.