这篇文章是老外写的：
关于带宽、噪声以及和Tek的波形比较等，个人觉得不错
关于ADC：
About ADC
SDS7102 have max samplerate 1Gs/s realtime (one channel) and 2 x 500Ms/s simultaneous for two channel.
ADC construction principle is most good what I have seen in this price class oscilloscope. Better than Hantek solution.
Owon use single chip ADC what is directly made for this speed!
(hantek use several 100MHz ADC's interleaved)
Owon ADC Chip is MXT2002 (RuiFeng China)
MXT2002 is National ADC08D500 clone. (exept case. ADC:128pin, MXT:144pin))
Some specs are slightly reduced but in my opinion not markable in this scope aplication and frequency range.
Non DES
ENOB 100MHz National typical 7.5 and clone 7.4
SNR 100MHz typical 47dB and clone 46dB
If go higher frequencies as example >200MHz then littlebit more differencies so than original win.
My opinion is: in this application differencies are not meaningfull.
National original chip is markable more expensive. (you can buy manyclone chips with one original chip price - but in critical aplicationsthese small differencies may be just enough)
Here is RuiFeng datasheet (not much text becouse can use national datasheet)
Note, you need support for chinese language, if want look all)
This ADC support directly 1Gs/s or 2x500Ms/s capturing.
Just simple change chip mode selection.
In this mode these two ADC's are internally interlieved with same clock.
This is very reliable and better way to do oscilloscope ADC than whatexample Rigol, Hantek, Atten, Siglent, GW etc. have used. ButHantek/Tekway and others basic design is old. They use same principle asRigol (etc). Several low speed ADC interleaved. Problem is timing andleveling these separate ADC's so it need lot of care that there do notrise any bad efects with timing jitter and level unbalance and otherunformity between ADC's.
This OWON solution is nearly free from these problems.
And also, this smart ADC have its own inside build low level calibration routine (it is not same as scope self calibration).
ADC is clocked with 500MHz clock and it need only one Clock source.
This clock generator is:
Analog Devices ADF4360-7 Integrated Synthesizer and VCO (350-1800MHz)
Clock reference is 10MHz.
不知道这个人为什么知道这么多，ADC MXT2002居然是仿的国半的ADC08D500 ，指标好像还可以哦！
希望使用SDS7102的人共同关注一下，视窗扩展如果能够设计的一点就好了，改成那种扫描形式的
现在的视窗拓展给我感觉就是实时快速分辨率切换了，没有别的功能，在视窗扩展中STOP后，是回不到主存储中间去的，回到主存储中也只有那么一截信号，对于观测小概率信号异常不利！ |
发表于 2013-3-8 12:05:41
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