- #1

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I need to find the voltage gain for the following scheme:

My book says I need to calculate 'id' first, which is:

**id = gm.ro.vin/(Rs+RL+ro+(gm.ro.Rs))**

Then with the help of vout = -RL.id you get:

**Av = -gm.ro.RL/(Rs+RL+ro+(gm.ro.Rs))**

So I get the last part, but I really have no clue how I get to 'id'...

Could anyone help me with this? Give me some more steps.. (my book only shows the above formulas).

Thanks!