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Calculating the effective output noise current of a cascode current mirror

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deepa

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i need to calculate the effective output noise current of a cascode current mirror,if M1 and M2 are the bottom mirroring transistors and M3 and M4 are the cascode devices,,then at the output,noise from which will dominate and how do u go about calculating this
 

Re: noise analysis

the contributions of M1 and M2 are dominant, and M3 and M4's contributions ignore
the noise current is
2*4*k*T*v*gm
v=1@linear region
v=2/3@saturation region
the calculation above for long channel MOS

for short channel MOS, v is larger
 

noise analysis

check Razavi's book, that is a paragraph analyze this problem.
 

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