palmeiras
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Hi guys,
In analog design, we learn that we can associate poles and nodes through the following rule:
"The pole frequency is given by the product of the inverse of R and C, between the node and the AC ground". For instance, for the output node of the circuit given bellow, the pole frequency (wp2) is 1/RD*CL.
Regarding the node "vin", Razavi book says that the is wp1 = 1/Rs*CL. It considers that vin is a AC ground. However, Vin is where the input signal is applied, and then, I cannot consider it as AC ground.
Why does Razavi considers Vin as a AC ground? And then apply the rule?
Thanks,
In analog design, we learn that we can associate poles and nodes through the following rule:
"The pole frequency is given by the product of the inverse of R and C, between the node and the AC ground". For instance, for the output node of the circuit given bellow, the pole frequency (wp2) is 1/RD*CL.
Regarding the node "vin", Razavi book says that the is wp1 = 1/Rs*CL. It considers that vin is a AC ground. However, Vin is where the input signal is applied, and then, I cannot consider it as AC ground.
Why does Razavi considers Vin as a AC ground? And then apply the rule?
Thanks,