milvapp
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Hi,
I am trying to implement a first order RC LPF with fc=500KHz
but instead of a regular R I use cascaded pmos working in cutoff region.
(image1)
I did AC analysis and as you can see the gain graph goes as expected,compared to the
phase graph.Can someone explain to me why is this happening and how will it
affect my filter?I have run AC analysis( substituting the cascaded pmos with a regular resistor) and the phase was fine.(At 45 deg f-3db was 500KHz).
These are the values of my circuit.
f=2.2GHz
fc=500KHz
R= 3.122MΩ
c=0,102 pF
W=120 um
L=200nm
Thnx in advance
I am trying to implement a first order RC LPF with fc=500KHz
but instead of a regular R I use cascaded pmos working in cutoff region.
(image1)
I did AC analysis and as you can see the gain graph goes as expected,compared to the
phase graph.Can someone explain to me why is this happening and how will it
affect my filter?I have run AC analysis( substituting the cascaded pmos with a regular resistor) and the phase was fine.(At 45 deg f-3db was 500KHz).
These are the values of my circuit.
f=2.2GHz
fc=500KHz
R= 3.122MΩ
c=0,102 pF
W=120 um
L=200nm
Thnx in advance