Some tips to calculate the transfer function of the following circuit

[nepdeep]

View attachment 81932

I have the problem in assuming the Vout of the circuit and secondly...do i also need to consider the Vcc in the diagram?
Thanks in advance...

 

[Rik797]

Hi,
If you need to calculate the transfer function, I suppose you are in the small-signal domain. Hence, you do not need to consider Vcc. Then:

1. Get the small-signal model of the MOSFET (common-source if it is a pMOS, common-drain if an nMOS)
2. Consider the opamp one-pole transfer function: Vout(s) = Vd(s) * A(s), in which A(s) = A0 / (1 + s / w0)
3. Redraw the entire diagram by using blocks instead of opamp and MOSFET

Regards,
Rik

 

[Shahgul]

how can we find transfer function of sinc function?

 

[Rik797]

The Fourier's transform of the sinc function, is the rect function.