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[moved] Current Mirror design

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BoneMonkey

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Hi,

Attached is a current mirror design I am a little bit confused about. I do not know what this kind of topology is called and thus cannot find any external information.

I do understand that this is a cascade current mirror, but I don't know what are the two external transistors doing and what is the benefit of having them in design.


CM.jpg
 

It's a standard cascode current mirror as described in any analog design text book. Plus two apparently useless transistor sourcing additional current to ground. You would want to review the place where you quoted the image for an explanation.
 
FvM said:
It's a standard cascode current mirror as described in any analog design text book. Plus two apparently useless transistor sourcing additional current to ground. You would want to review the place where you quoted the image for an explanation.
Click to expand...

Hi FvM,

Thanks for the answer. I do not have a source for the image, because I made it myself. However, I am analyzing an existing ramp generator design, where I found this topology.
 

If the source circuit design was an IC then maybe the
"do-nothing" leg is contingency spares or an option for
a doubling of ramp slew rate (in metal, later). Or the
dummies for matching. Although in either case I would
have left the dummy leg open, not shorted to ground
to waste current.
 

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