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Low voltage wide-swing cascode current mirror

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richloo

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wide-swing cascode current mirror martin

Hi there, i've failed to bias wide-swing cascode current mirror properly using 1.8V supply. The circuit i used is Fig 6.11 from Ken Martin book. Is it impossible to bias 4 transistors in cascode because of 4xVdsat? I need high current so that i can reach high slew rate. Can anyone help me or give me suggestion? Thanks in advance!
 

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