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CSE245 Lab 2

CSE245 Lab 2. R1=1k R2=2k R3=3k C1=100f C2=200f L1=1000n V1 is a trapezoidal pusle voltage source. SPICE netlist for V1 is: pulse(0 1 0n 0.50n 0.50n 4n 10n) Initial conditions for C1, C2 and L1: 0. CSE245 Lab 2. 1) Use PowerSPICE or HSPICE to simulate the circuit in slide 1.

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CSE245 Lab 2

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  1. CSE245 Lab 2 • R1=1k • R2=2k • R3=3k • C1=100f • C2=200f • L1=1000n • V1 is a trapezoidal pusle voltage source. SPICE netlist for V1 is: pulse(0 1 0n 0.50n 0.50n 4n 10n) • Initial conditions for C1, C2 and L1: 0

  2. CSE245 Lab 2 • 1) Use PowerSPICE or HSPICE to simulate the circuit in slide 1. • Transient simulation from 0 to 10ns.Plot v(1), v(2), v(3), v(4). • 2) Use Modified Nodal Analysis (MNA) to write the transient circuit matrix for the circuit. For capacitors and inductors, use Trapezoidal integration method. A sample MNA matrix could be found in the Matlab script of lab1. • 3) Write a Matlab script to simulate the circuit in slide 1. • Simulate the circuit (Transient simulation from 0 to 10ns) with 3 different integration methods: Forward Euler, Backward Euler and Trapezoidal. • Devise a time stepping scheme that uses as few as time points as possible. In lab1 one we used a fixed time step delta, in this lab the general idea is to use small time steps when the circuit is changing and large time steps when the circuit is flat. • 4) Deliverables • MNA Matrix (trapezoidal integration). • Matlab script, explain your time stepping scheme. • Comparison and explanation of the results from Matlab and different integration methods. • Simulation waveforms of v(1), v(2), v(3), v(4) from both Matlab and PowerSPICE/HSPICE. Compare your Matlab results with PowerSPICE / HSPICE.

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