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Spice Assignment

Spice Assignment - ECSE 330 Introduction to...

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- Page 1 of 8 - ECSE 330 Introduction to Electronics (Winter 2009) SPICE Assignment Deadline: April 13 th , 2009 Total Points: 50 Assignment Drop-off Location: Submit the assignments in the ECSE330 assignment box on the 2 nd Floor of the Trottier Building. General Notes: You may work in groups of one, two or three persons. For each part of a SPICE programming question, you should submit the corresponding circuit (.cir) file and printouts of any generated graphs. Submit an output file (.out) only when the question requires it. Messy work will lose marks. Typed work is best, but neat hand-drawn schematics are acceptable. Properly organize your code and use comments where appropriate. Be sure to answer all questions asked in each part.

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- Page 2 of 8 - Question 1 Diode Limiter (5 pts) Consider the following diode limiter in Fig. 1. Use the model provided below for the diode. R1 is a 100 resistor. Fig. 1. Diode Limiter. Diode model: .model diode d (Is=2.682n n=1.836) Implement the diode limiter of Fig.1 in SPICE and plot the resulting output voltage when the DC voltage at the input is swept from -4V to +4V. Include your .cir file as well as the plot of the output voltage vs. the input voltage.
- Page 3 of 8 - Question 2 Op-Amp Sub-circuit Modeling (10 pts) Consider the ideal and non-ideal Op-Amp models in Fig. 2 a) and b), respectively. a) b) Fig. 2. Op-Amp models. In the ideal Op-Amp model pictured in Fig. 2 a), it is assumed that there is an infinite input resistance, zero output resistance, and the open loop gain A is infinite. A more realistic model of the Op-Amp is shown in Fig. 2 b) which includes finite input resistance and open loop gain as well as an output resistance. To model a voltage controlled voltage source in SPICE, use the following code: Evcvs n+ n- nc+ nc- gain Note: the VCVS name must start with the letter ‘E.’ The orientation of the independent and dependent nodes is shown in Fig. 3.

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Spice Assignment - ECSE 330 Introduction to...

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