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lipkai
Joined: 03 Mar 2008
Posts: 7
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 03 Oct 2008 11:25 What current mirror to use? |
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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.
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mpig09
Joined: 26 Aug 2005
Posts: 123
Helped: 6
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| 04 Oct 2008 14:57 Re: What current mirror to use? |
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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
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Sadegh.j
Joined: 29 Nov 2006
Posts: 702
Helped: 32
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| 05 Oct 2008 21:46 Re: What current mirror to use? |
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| Read Gray, I think he explains it well
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bacharya
Joined: 16 Mar 2008
Posts: 3
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| 07 Oct 2008 6:15 What current mirror to use? |
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| 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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