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Looking for current mirror design solutions for PCB

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KamW

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current mirror design

In my new design I have to use current mirrors. I have one current with hundreds of nA, and I have to mirror it in 1:1, 1:10, 1:100 and 1:1000 ratios. Of course thermal compensated. I know it is simple with IC design - a few transistors, resistors, cascode etc., but I am looking for any IC or another solution I could use on my PCB.

regards
KamW
 

lqy

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I'm first time to hear some mirror in the PCB.
Maybe you can use some discrete transistors to design it like in the IC design.
 

KamW

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Re: current mirror design

there are manufacturers who made current mirrors. For instance check Philips BCV61 / BCV62 But problem is that there are only pairs. There was one very interesting chip from (as I remember) TI, with more transistors. But now it is obsolete. So as you could see there are solutions for current mirror on pcb. Problem is that transistors should be on the same substrate, to decrease problems (temperature and etc.). But why do you think mirrors couldn't be used on "discrete" solutions? If sometimes it is easier to use simple mirror than tons of amplifiers.

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KamW
 

Aoxomox

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KamW

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Re: current mirror design

Thx Aoxomox for your informations. It was very usefull, I have not found motorola chips before. As for my requirements I have no requirements - except prices. transistors may not be matched. I am not interested in 1:1 ratio - 1:1.234445453 could be acceptable because of callibration process of each unit. Price is more importnant (low of course). I've found very old UL1111 - 5 transistors in one case - ultra cheap. I think it could be usefull, but I am wondering if could I use it becouse of obsolete parts problem. As I know it is not in production, and I am wondering if could I use it in my project. Now I could buy it but in near time .... It is why I am looking for another ideas.

Regards
KamW
 

7rots51

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Re: current mirror design

hi
check REF200 from TI(burrbrown) ,It may be useful.
 

KamW

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Re: current mirror design

Thx 7rots51
but it's still one mirror :?
 

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