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Unformatted text preview: Lecture 10 MOSFET circuits at DC • Now that we have the behavior of the MOSFET worked out, we can start to look at applying them in circuits. • We’ll start with DC circuits just to get a feel for how they are set up. • We don’t need any more formulas to work this part, so we’ll cover some examples Example 1 • Let us consider this circuit. • The NMOS has: – V t =0.7 V – μ n C ox =100 μ A/V 2 – L=1 μ m, W=32 μ m – We will neglect channel length modulation • We want to have: – I D =0.4 mA – V D =+0.5 V • We need to find the values of the two resistors. Example 1 • In this configuration the gate is grounded and we are expecting to get a drain voltage that is positive. • This means by definition we are working with a sourcedrain voltage higher than the gate voltage and thus are in saturation. • We will want to get the gate source voltage (in terms of the overvoltage for convenience) from the parameters given and the specified drain current....
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 Summer '10
 Staff
 Electronics, Work, 1 m, 4 m, 5k, 2 2 L, 3.25k

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