Does anybody know the benefit of biasing like this?

[wwwww12345]

Hi all, I saw some bias like the one in the attached picture. n0 and n1 are used for nmos current biasing. Do someone know the benefit of bias n0 like that? I only know it it a wilson current, but the bennefit of wilson current is to boost the output resistance . I cannot see the benefit of it.

 

[Alex_IC]

As I can judge, there is a negative feedback which stabilaze the n0 voltage with high loop gain. This reduce voltage drop at n0 node due to current drawing from there. This would be benefit if you use n0 as a voltage reference.

 

[wwwww12345]

As I can judge, there is a negative feedback which stabilaze the n0 voltage with high loop gain. This reduce voltage drop at n0 node due to current drawing from there. This would be benefit if you use n0 as a voltage reference.

Thank you, Alex. But n0 and n1 are the 2 bias of the nmos cascode, n0 the lower bias and n1 the cascode bias. I just wonder why they use another current bias to generate n1, I think it wasteful.

 

[rajanarender_suram]

As I can judge, there is a negative feedback which stabilaze the n0 voltage with high loop gain. This reduce voltage drop at n0 node due to current drawing from there. This would be benefit if you use n0 as a voltage reference.

Thank you, Alex. But n0 and n1 are the 2 bias of the nmos cascode, n0 the lower bias and n1 the cascode bias. I just wonder why they use another current bias to generate n1, I think it wasteful.

if n1 is waste than how do you bias the M3....

 

[Alex_IC]

This is alternative circuit

 

[Jim cage]

where does this circuit is taken from?

 

[wwwww12345]

As I can judge, there is a negative feedback which stabilaze the n0 voltage with high loop gain. This reduce voltage drop at n0 node due to current drawing from there. This would be benefit if you use n0 as a voltage reference.

Thank you, Alex. But n0 and n1 are the 2 bias of the nmos cascode, n0 the lower bias and n1 the cascode bias. I just wonder why they use another current bias to generate n1, I think it wasteful.

if n1 is waste than how do you bias the M3....

Hi, I am Sorry for mixed these two names up. My idea is that if we want to bias cascode nmos, we can use 2 current branches, one for n0 and one for n1 ,but they use 3 current branches ,one for n1 and two for n0, I thank the latter wastful, for I cannot see the benefit of n0 biasing.

Added after 28 minutes:

This is alternative circuit

Thank you , Alex. It seems n0 more important than n1, so using this bias.