## Description

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.