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what is the limit of mirroring ratio.

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avinash

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i have a current source of 100uA.I need 2mA current.could this be achieved by transistor mirroring operation.if yes,what is the trade-off.
 

vlsiattitude

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well there is no hard and fast rule for that but in my opinion dont go for mirroring ratios greater then 5 as it would degrade matching.if u dont want 2mA current to be accurate u can go for that.

but try to make layout with fingers(interdigitised),place dummies etc
 

vbhupendra

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you can get 2mA.
mirror 100uA to 500uA then 500uA to 2mA

may be try using cascode mirror.

then use interdigitized layout.
 

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