请问IDAC +电流镜会比VDAC +电流转换器更好吗？

我以前用过这个方法，在A中增加了动态范围。
LV情况，3.3V操作，并且非常有效地去除
镜面输入端的兼容问题。以你为例
同时在电流镜输出端获得高压电压。这个
明显的挑战是晶体管匹配，线性等。
镜子容易下沉，源点难度的影响
VDD，或镜面方程的高侧参考效应。
有很多信息网站，只是睁眼”电流镜的设计”，你
将阅读到下个世纪。
问候，Dana。



     以下为原文
  I used that method in the past do get increased dynamic range in a
    LV situation, 3.3V operation, and was very effective at removing the
    complience issues on the input side of the mirror. In your case you
    also get the HV ability on the output side of the current mirror. The
    obvious challenges are transistor matching, linearity, etc.....
     
    Sink mirrors easiest, source a little more challenging because of the effects
    of Vdd, or high side reference effects on mirror equations.
     
    There is a lot of info on web, just goggle "current mirror design", you
    will be reading well into the next century.
     
    Regards, Dana.

就拓扑而言，最简单的一个看起来是——
你应该做一个错误分析，看看你的目标是否得到满足。
问候，Dana。



     以下为原文
  As far as topology, one of the simplest looks like -
     
     
    You should do an error analysis to see if your goals are met.
     
    Regards, Dana.

一个很好的参考镜子
HTTP://HyrEd.McGRAW-HIL.COM/SITES/DL/FRIE/070601624/37358/JAE20990YCH16.PDF
问候，Dana。



     以下为原文
  A good reference on mirrors -
     
    http://highered.mcgraw-hill.com/sites/dl/free/0070601623/337358/jae20990_ch16.pdf
     
    Regards, Dana.

谢谢你提供的信息。我知道转发器匹配问题，但我现在发现一个集成的电流镜像IC。不知道这会不会有帮助。
您张贴的图像类似于我的电压控制电流源（见PIC）。然而，我似乎不能选择正确的晶体管。当负载超过某一点时，所有的模拟都失败了，但是在电压符合范围内。
此外，我正在考虑使用开关方案或电流转向方案来改变电流方向与负载。这将允许我使用一个拓扑。
你喜欢VDAC +电压控制电流源的IDAC +电流镜解决方案？
维康
13.7 K



     以下为原文
   Thanks for the info. I'm aware of transitor matching issues, but I am currently find an integrated current mirror IC. Don't know if that will help.
    The images you posted are similar to my voltage controled current source (see pic). However I can't seem to choose the correct transistor. All my simulations are failing when my load gets above above a certain point, but within voltage compliance.
    Also, I'm considering usinga switching scheme or current steering scheme to change current  direction withing the load. That will allow me to use one topology. 
    Would you prefer the VDAC + voltage controled current source over the iDAC + current mirror solution?

•   Vcon_Isource.png 13.7 K