cascode and basic current mirror

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Jalpa Pandya

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the cascode current mirror circuit designed by me in simelectronics gives me less current as compared to basic current mirror circuit. for basic current mirror w/l ratio = 2/0.18um i get current of nearly 97.5uA. my reference current is 100uA. For cascode current mirror i get current of 98uA at 18/0.18. Can anyone please help me.
 

What is your headroom? The classic cascode needs Vmin=2·Vod+Vth. In addition using minimum L mosfets is bad idea due to channel modulation effects and higher threshold voltage for fets with Lmin.
Check dc OPs, I bet that in cascode CM some of your transistors works in triode region.
 

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