# Amplifiers homework problem

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 P: 61 1. The problem statement, all variables and given/known data 2. Relevant equations $$dI = \frac{\partial I}{\partial V_{GS}} dV_{GS} + \frac{\partial I}{\partial V_{DS}}dV_{DS}$$ 3. The attempt at a solution I was just wondering why $$\small V_{G}$$ is at 0. I have solved the entire question (there are more parts :P), but I could only do it once I was told that $$\small V_{GS} = - V_S + V_G = - V_S$$. I am having a hard time getting my head around that. Shouldn't $$\small V_{G}$$ simply be $$\small V_{i}$$?

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