HW6_soln

# HW6_soln - PHYS3360/AEP3630 Electronic Circuits Spring 2011...

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PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW6 Solutions 1 BJT’s and Computer-Aided Circuit Design Solutions 1.

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PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW6 Solutions 2 2. Refer to file problem2.asc uploaded with the solutions. Your SPICE statements should include .step param Vdd -0.9 12.0 0.1 .include 2N7000.mod .op Having run the example, hold Alt key to transform the cursor into a current probe and plot the curve (should be as seen in the plot on the right). One can use cursors to find power and incremental resistance at 5V. Generally, it is more convenient to use .meas statements. The following statements achieve the goal: .meas op Vop param 5 ;voltage to get data at .meas op dV param 0.01 ;voltage step (for Rdiff) .meas op V1 param Vop-dV; .meas op V2 param Vop+dV; .meas op Ival1 find Ix(U1:D) when V(DD) = V1 ;get current at V1 .meas op Ival2 find Ix(U1:D) when V(DD) = V2 ;get current at V2 .meas op Power param Vop*(Ival1+Ival2)/2 ;compute power (W) .meas op Rdiff param (V2-V1)/(Ival2-Ival1) ;compute Rdiff (Ohm)
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