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Ve311 Homework #1

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Ve311 Homework #1
online submission
Note:
(1) Please use A4 size papers.
(2) Please use the SPICE model below for simulation.
.model Dbreak D Is=1e-10 Rs=0 N=1 TT=0 Cjo=0pF
1. [Pspice Simulation of Si PN Junction Diode]
(a) [25%] Use DC sweep to find out the diode’s turn-on voltage (Von).
(b) [25%] For the circuit below, plot ID vs Vin as Vin increases from
−2 V to 2V . Use the constant voltage drop model and the Von
obtained in (a) to explain why the result is a linear increase rather
than an exponential increase.
(c) [25%] For the circuit below, plot Vout vs time and Vin vs time on the
same graph, when Vin = 2 sin(2π × 100 × time). Use the constant
voltage drop model and the Von obtained in (a) to explain the result.
(d) [25%] For the circuit below, plot Vout vs time and Vin vs time on the
same graph, when Vin = 2 + 0.01 sin(2π × 100 × time) . Use the
constant voltage drop model and the Von obtained in (a) to explain the
result.