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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. Well start with DC circuits just to get a feel for how they are set up. We dont need any more formulas to work this part, so well cover some examples Example 1 Let us consider this circuit. The NMOS has: V t =0.7 V n C ox =100 A/V 2 L=1 m, W=32 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
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 Electronics, Work

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