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Is this a good current bias

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happsky

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vdsat is very large ,will this cause any problem?
this bias is used in vco.
thanks very much.
 

View attachment 77088
vdsat is very large ,will this cause any problem?

For what? For the VCO lock-in? Depends.
M6 & M7 both work in strong inversion mode, so large vdsat is normal. M6 correctly works in saturation region, M7 in triode region however, which lowers the loop gain and inserts an additional(?) non-linearity into the control loop. But this still could work well.
 
For what? For the VCO lock-in? Depends.
M6 & M7 both work in strong inversion mode, so large vdsat is normal. M6 correctly works in saturation region, M7 in triode region however, which lowers the loop gain and inserts an additional(?) non-linearity into the control loop. But this still could work well.
Thank, you,it's very kind of you!
and below the M7 there is a cross couple pair MOS ,which is the core of VCO.
 

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