Question
If the drain current for the 2N3797 MOSFET of Fig. 31 is $8 \mathrm{~mA}$, what is the maximum permissible value of $V_{D S}$ utilizing the maximum power rating?
Step 1
First, we need to find the maximum power rating of the 2N3797 MOSFET. According to the datasheet, the maximum power dissipation for this MOSFET is $P_{max} = 1 \mathrm{~W}$. Show more…
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Consider the power MOSFET described in Problem 15.18. (a) For $V_{D D}=60 \mathrm{~V}$, determine the value of $R_{L}$ such that the maximum power is delivered to the load and the transistor remains biased in the safe operating area. For this case, what is the maximum allowed drain current? $(b)$ For $R_{L}=10 \Omega$, determine the maximum value $V_{D D}$ such that the maximum power is delivered to the load and the transistor remains biased in the safe operating area.
Consider an n-channel MOSFET with the following parameters: $k_{n}^{\prime}=0.18 \mathrm{~mA} / \mathrm{V}^{2}$, $W / L=8$, and $V_{T}=0.4 \mathrm{~V}$. Determine the drain current $I_{D}$ for (a) $V_{G S}=0.8 \mathrm{~V}$, (c) $V_{G S}=0.8 \mathrm{~V}, V_{D S}=2.5 \mathrm{~V} ;$ and $V_{D S}=0.2 \mathrm{~V} ;(b) V_{G S}=0.8 \mathrm{~V}, V_{D S}=1.2 \mathrm{~V}$ (d) $V_{G S}=1.2 \mathrm{~V}, V_{D S}=2.5 \mathrm{~V}$.
(a) In a power MOSFET, a maximum gate voltage of $8 \mathrm{~V}$ is to be applied. Determine the minimum oxide thickness necessary if a safety factor of 3 is specified. (b) Repeat part $(a)$ if the maximum gate voltage is $12 \mathrm{~V}$.
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