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Current mirror questions - wilson vs. cascode

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teem

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Current mirror questions

Dear,

I am confused with below two curcuits. Are they the same from all aspects?
18_1258452662.jpg


Besides, can I diode connect Q12 instead of Q13 for the following bias circuits.
75_1258452668.jpg


Thanks very much and wish a good day.
 

Re: Current mirror questions

In last Picture if diode connect Q12 instead of Q13 then you have wilson current mirror.
Wilson current mirror is difirent form cascode Current mirror for example their out
resistance,ok?
Dont forget to press help me
 

    T

    teem

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1. But as I know, in the figures, wilson mirror has the same Rout as cascode mirror.

2. I am really confused about the difference if I diode connect Q12 instead of Q13 in the bias circuit.

Anyone can help explain?

Thanks.
 

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