**QUESTION**

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B. Current Steering and Mirror (Fig. 2) (50 pt) 1. [Hand Calculation] Determine the value of $R_{1}$ in order to have $I_{\mathrm{REF}}=0.1 \mathrm{~mA}$. Show your calculation. (20 pt) - $R_{1}=$ \[ V_{D D}=1.0 \mathrm{~V} \quad V_{D D}=1.0 \mathrm{~V} \] Fig. 2 A current-steering MOS circuit. $\left|V_{t}\right|=$ $0.6 \mathrm{~V} \Rightarrow \mathrm{VT} 0$ of nmos $4=0.6 \mathrm{~V}$ and VTO of pmos $4=-0.6 \mathrm{~V}, k_{n}^{\prime}=k_{p}^{\prime}=$ $5 \mathrm{~mA} / \mathrm{V}^{2}, L=1 \mu \mathrm{m}, W_{1}=1 \mu \mathrm{m}, W_{2}=10 \mu \mathrm{m}$, $W_{3}=10 \mu \mathrm{m}, W_{4}=5 \mu \mathrm{m}, \lambda=0$. When you move or drag a component, you can quickly rotate it with CTRL-r. To mirror a comoponent, use CTRL-e. 2. [Hand Calculation] \& [LTspice] Determine $I_{2}$ and $V_{2}$. Show your calculation. (10 pt) - $I_{2}=$ - $V_{2}=$