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Current mirror function

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transign

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Hello, I would like to ask which is the function of Mc and MR works in this current mirror? how Mr is properly biased?
Thank you very much!!
 

Hi,
Rb and Cb are used to simply filter the noise coming from Mref. Since Rb can be quite large, the resistance of the filter can be realized using MR (MOS resistor). Mc simply guarantees that MR is in triode.
 

    transign

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