Question regarding Constant Current Modeling of Buck

[Dextrine]

Hello everyone,

I was reading this application note and I am having trouble understanding how a parallel RC circuit with ESR bring driven by a current source has a transfer function of 1-pole. When I do my math I get a pole and a zero.

I have attached an image of the claim that there's 1-pole as well as the link to the AN.

Thank you all very much.

http://cds.linear.com/docs/en/application-note/AN149fa.pdf (Page. 11)

 

[donpacino]

can you provide us with more info. what did you get for a transfer function. what did they get...