I have simulated a cascode and made a M2 in saturation so it will act as a current source. I want to understand which current source is better. Is cascode better because it has a higher output impedance than the current mirror ?

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    \$\begingroup\$ Next time please zoom in on the schematic, and maybe put it on a white background if you can. \$\endgroup\$ – C_Elegans Mar 21 '18 at 22:35
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    \$\begingroup\$ Cascode structure has higher output impedance so the current will more constant that mirror. However, the minimum voltage requirement also higher which is a disadvantage. So which is better will depend on the application, low voltage or high voltage and how constant current necessary is. \$\endgroup\$ – anhnha Mar 22 '18 at 10:05

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