For a MOS common-source amplifier, which of the following is true ? Select one:

Question

For a MOS common-source amplifier, which of the following is true ?

Select one:

a. None of these

b. The input signal is applied to the drain (i know that input signal is applied on gate so this is wrong)

c. The source is used by both the input and output ports (this is what i am really confused, gate is for input and drain is for output but what about source?

All i see in my lecture note is, MOSFET has 3 terminals and two ports need 4 terminals. That means, one terminal is shared between input and output ports. - this is the part i am quite not sure. )

d. Different circuit topologies are used for NMOS than for PMOS FETs (i know this is wrong since NMOS and PMOS has same topologies in common-source amp.)

e. The output signal is measured at the gate (The output signal is measured at drain so this is wrong as well.)

The answer has to be either A or C but I really dont know.

Explanation / Answer

Option C is correct

Because input voltage is measured between gate and source terminal ,thus we can say source is shared by input .

Similarly output is measured between drain and source . Thus source is shared by output also.h hence option 'C' is correct.

In source degenerate amplifier you will better understand.

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