enter image description here

What this does this circuit do? I suspect it is an amplifier, but don't know how it amplifies.

For example Inv 5 and Inv 6 are connected in parallel with reverse sides but there is a wire between them, wouldn't that wire just cancel whatever their function is and they are there for ?

How do Inv 7 and Inv 8 affect gain of the circuit if this actually is an amplifier ?

Some information :

Assuming size of Inv7 and Inv8 3 times other inverters and I(inverter 6) =100uA and input CM equals to voltage of Point A.

Find current of other transistors Va=Vdd/2=1.5

  • 5
    \$\begingroup\$ Where did you get the circuit? What other information was provided along with the schematic? Why do you care what it does...what are you trying to accomplish? \$\endgroup\$ Jan 5, 2019 at 12:54
  • 3
    \$\begingroup\$ A similar but simpler circuit is the "Nauta gm-cell", read about it here: ris.utwente.nl/ws/portalfiles/portal/6771395/… then learn from the article how such a circuit is analyzed and apply the same technique to this circuit. \$\endgroup\$ Jan 5, 2019 at 12:59
  • \$\begingroup\$ this is an example from a question our professor gave to his students in recent years. i've updated the question to add some more details. \$\endgroup\$ Jan 5, 2019 at 13:02
  • 1
    \$\begingroup\$ Why is there a short circuit across Inv5 and Inv6? If you want my opinion, it's a nonesense circuit. Good luck in the exam though. \$\endgroup\$
    – Andy aka
    Jan 5, 2019 at 14:19
  • 1
    \$\begingroup\$ It has some unstable tendencies from the inner loop short, but it has very high gain and imbalance errors in gm can be reduced by precision R ratios i.stack.imgur.com/yxduO.png looks terrible. \$\endgroup\$ Jan 5, 2019 at 21:55


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