Consider the circuit in Figure 10.21 in the text. Assume (I_{mathrm{REF}}=50 mu mathrm{A}) and assume transistor parameters

Question:

Consider the circuit in Figure 10.21 in the text. Assume $I_{\mathrm{REF}}=50 \mu \mathrm{A}$ and assume transistor parameters of $V_{T N}=0.8 \mathrm{~V},\left(\frac{1}{2}\right) \mu_{n} C_{\mathrm{ox}}=48 \mu \mathrm{A} / \mathrm{V}^{2}$, $\lambda=0$, and $\gamma=0$.

(a) Find $W / L$ such that $V_{D S 3}($ sat $)=0.2$ V.

(b) What is $V_{G S 5}$ ?

(c) What is the minimum voltage at the drain of $M_{1}$ such that all transistors remain biased in the saturation region?

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