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What current mirror to use?

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lipkai

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wilson current mirror accuracy

I'm studying current mirror right now and I'm wondering how do we choose between widlar, wilson and cascode current mirror?
Is there any disadvantages of using widlar/wilson current mirror in CMOS circuit? The textbook by Baker didn't even mention about these 2 current mirrors.
 

disadvantages of widlar current mirror

Dear lipkai:

When I design current mirror, I think these points:
1. VDD voltage
2. accuracy
==>you can try to analysis the advantages and disadvantages ofeach type of current mirror, I think you can know how to use these current mirror.

I hope it can help you.
mpig
 

Read Gray, I think he explains it well
 

if you are going to use this in a circuit and the accuracy of the current source depends on the circuit performance, I would advise to use a supply independent current mirror. This current source can also used in circuit biasing. Read Chap 11-Razavi ( Design of Analog CMOS Integrated Circuits ) , Supply Independent Biasing. The resistance used in the circuit avoids the current fluctuation with reference to change in supply voltage.
 

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