Consider the NMOS cascode current source in Figure 10.18. The circuit parameters are (V^{+}=5 mathrm{~V}, V^{-}=-5 mathrm{~V}),

Question:

Consider the NMOS cascode current source in Figure 10.18. The circuit parameters are $V^{+}=5 \mathrm{~V}, V^{-}=-5 \mathrm{~V}$, and $I_{\mathrm{REF}}=100 \mu \mathrm{A}$. All transistors are matched with parameters $V_{T N}=0.5 \mathrm{~V}, K_{n}=100 \mu \mathrm{A} / \mathrm{V}^{2}$, and $\lambda=0.02 \mathrm{~V}^{-1}$.

(a) Determine $I_{O}$ for $V_{D 4}=-2 \mathrm{~V}$.

(b) Determine the percent change in $I_{O}$ as $V_{D 4}$ changes from -2 to $+2 \mathrm{~V}$.

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