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Hello everyone

I was hoping you could help me with something, in my analog electronics course..

In the diagram below, is displayed a circuit and its equivalent...

I don't understand why the input resistance is only the parallel combination of R

Why doesn't R

The text explains it as follows "Since the low-frequency input resistance looking into the gate of the MOSFET is essentially infinite, the input resistance is only a function of the bias resistors." but I don't get it. Maybe I wrongly understood what the input resistance is?

any explanation would be greatly appreciated

I was hoping you could help me with something, in my analog electronics course..

In the diagram below, is displayed a circuit and its equivalent...

I don't understand why the input resistance is only the parallel combination of R

_{1}and R_{2}??Why doesn't R

_{si}contribute to the input resistance?The text explains it as follows "Since the low-frequency input resistance looking into the gate of the MOSFET is essentially infinite, the input resistance is only a function of the bias resistors." but I don't get it. Maybe I wrongly understood what the input resistance is?

any explanation would be greatly appreciated