How to reduce the VDS drop across M6 in this circuit?

[rampat]

In the following ckt whcih device sets the vds drop across M6..How to reduce the VDS drop across M6..

 

[amarnath]

biasing problem

the vds if M6 is set by the vgs of M5 which in turn is set by the size of M5.This is a high swing cascode. mostly used as a load in cascode opamps(folded,telescopic etc)

amarnath

 

[nxing]

biasing problem

I would say that all of the size of M5, M6 and M10 will affect the Vds of M6, actually, these three form a voltage divider, is that correct?

 

[kenlino]

biasing problem

If you want to reduce the VDS drop across M6,you can reduce the bias "vbp",this way M6 source drop,then the VDS of M6 drop.

 

[ambreesh]

Re: biasing problem

The current through the leg, would fix the vgs for M5 and also its size. The vpp bias on gate of M6 fixes the drain potential for M5.

 

[ameed]

Re: biasing problem

hi all,

if you are setting M5 and M6 you are getting following result.

the vds if M6 is set by the vgs of M5 which in turn is set by the size of M5.This is a high swing

cascode. mostly used as a load in cascode opamps(folded,telescopic etc) :idea:

thanx.....