Fully differential with CMFB

Thread Starter


Joined Jan 16, 2023
Hello all,

I'm required to design a fully differential amplifier with CMFB.
the minimal requirements are:

Vdd=2 [v]
closed loop gain=2
Dynamic range at output, DR >80 [db]
settling error<0.5 mV
settling time<50 ns
load capacitance 10 pF
phase margin >60 degrees
power keeping low as possible

I would like to get some ideas for specific circuits that can satisfy those requirements.
any other tips for this design are very welcomed!

thanks in advaned!


Joined Oct 2, 2009
Thread moved to Homework Help.

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Joined Mar 30, 2015
we are not sure if it is a smart idea to continue with this circuit. the phase margin needed is quite big.
Circuit in question:
The transistor symbols are non-standard. Are they supposed to be enhancement mode MOSFETs?

Using humps with connection dots went out of style decades ago...