Calculate impedance of a feedback circuit with Blackman's technique

[NascentOxygen]

This has been a fine, collaborative effort. Well done, all contributors!

 

[LvW]

Yes - and caused by an interesting question from the OP (forcing us - includiung me - to remember and apply Blackmans rule).

 

[rude man]

Yes - and caused by an interesting question from the OP (forcing us - includiung me - to remember and apply Blackmans rule).

@ LvW - just as a final note - the fact that the upper FET can operate as a cascode connection (by suitably setting its gate bias) you can indeed operate the lower FET in the linear mode while keeping Vds essentially constant - meaning your assumption of operating in the linear mode while keeping g_m constant, is fully validated.
Over and out!
rm

 

[LvW]

rude man - thank you for this final remark.