Figure 8.5.1
The modified Wilson current mirror of Fig. 8.5.1 utilizes four matched transistors for which $V_{t}=$ $0.4 \mathrm{~V}, \mu_{n} C_{o x}=400 \mu \mathrm{A} / \mathrm{V}^{2}$, and $V_{A}=3 \mathrm{~V}$. It is required to design the circuit so that $I_{O}=0.2 \mathrm{~mA}$ with all transistors operating at $V_{O V}=0.2 \mathrm{~V}$.
(a) Find the required value of $R$.
(b) Find the required value of the $W / L$ ratio for each of the four transistors.
(c) Find the value of the output resistance $R_{O}$.
(d) What is the minimum voltage permitted at the output?

Question

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The Answer of

Figure 8.5.1
The modified Wilson current mirror of Fig. 8.5.1 utilizes four matched transistors for which $V_{t}=$ $0.4 \mathrm{~V}, \mu_{n} C_{o x}=400 \mu \mathrm{A} / \mathrm{V}^{2}$, and $V_{A}=3 \mathrm{~V}$. It is required to design the circuit so that $I_{O}=0.2 \mathrm{~mA}$ with all transistors operating at $V_{O V}=0.2 \mathrm{~V}$.
(a) Find the required value of $R$.
(b) Find the required value of the $W / L$ ratio for each of the four transistors.
(c) Find the value of the output resistance $R_{O}$.
(d) What is the minimum voltage permitted at the output?

Figure 851 the Modified Wilson Current Mirror of Fig Vt=V_{t}=Vt​= 0.4 V,μnCox=400μA/V20.4 \mathrm{~V}, \mu_{n} C_{o x}=400 \mu \mathrm{A} / \mathrm{V}^{2}0.4 V,μn​Cox​=400μA/V2

Figure 851
the Modified Wilson Current Mirror of Fig $V_{t}=$ $0.4 \mathrm{~V}, \mu_{n} C_{o x}=400 \mu \mathrm{A} / \mathrm{V}^{2}$