Question

In the circuit shown in Eigure P10.12, the MOSFET operates in the saturation region, for $I_S=0.5 \mathrm{~mA}$ and $V_S=3 \mathrm{~V}$. This enhancement-type PMOS has $V_t=-1 \mathrm{~V}$, and $K=0.5 \mathrm{~mA} / \mathrm{V}^2$. Find: a. $\quad R_S$ and the ratio $R_1 / R_2$. b. The largest allowable value of $R_S$ for the MOSFET to remain in the saturation region. Figure P10.12

   In the circuit shown in Eigure P10.12, the MOSFET operates in the saturation region, for $I_S=0.5 \mathrm{~mA}$ and $V_S=3 \mathrm{~V}$. This enhancement-type PMOS has $V_t=-1 \mathrm{~V}$, and $K=0.5 \mathrm{~mA} / \mathrm{V}^2$. Find:
a. $\quad R_S$ and the ratio $R_1 / R_2$.
b. The largest allowable value of $R_S$ for the MOSFET to remain in the saturation region.
Figure P10.12

Principles and Applications of Electrical Engineering

Giorgio Rizzoni,… 7th Edition

Chapter 10, Problem 12

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In the circuit shown in Eigure P10.12, the MOSFET operates in the saturation region, for $I_S=0.5 \mathrm{~mA}$ and $V_S=3 \mathrm{~V}$. This enhancement-type PMOS has $V_t=-1 \mathrm{~V}$, and $K=0.5 \mathrm{~mA} / \mathrm{V}^2$. Find: a. $\quad R_S$ and the ratio $R_1 / R_2$. b. The largest allowable value of $R_S$ for the MOSFET to remain in the saturation region. Figure P10.12

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