# hw4 - in Pspice using D1N4002 diodes(replace the...

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ELEN 325 HOMEWORK #4 ( Due date: Monday October 9, 2006) 1. In the circuit below, the opamp is ideal. Use constant-voltage-drop model for the diodes, and show all your calculations. (a) Sketch V o vs. V i . (b) Sketch V o ( t ) vs. t if V i ( t ) is a sine-wave with 1 V amplitude. (c) Simulate the circuit using D1N4002 diodes in Pspice and verify your results in (a) and (b). Provide schematics and all necessary plots with measurements. D 1 U 1 D 2 1k R 1 4k R 2 2k R 3 0 0 V i V o 2. Design AC adapters using: (a) A single-ended transformer with a bridge rectifier (b) A center-tapped transformer with a full-wave rectifier with the following specifications: Output voltage ( V o ) 9 V Maximum ripple 6% Load current ( I L ) 0 – 400 mA For each case, determine the minimum specs for the diode ( I D,max , I D,avg , reverse breakdown voltage), primary/ secondary ratio of the transformer ( n ), and the capacitance value. Show all your calculations. Simulate your designs
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Unformatted text preview: in Pspice using D1N4002 diodes (replace the transformers with voltage-controlled voltage sources). Measure V o , V r , I D,max and I D,avg when I L = 400 mA. Provide schematics and all necessary plots with measurements. 3. In the circuit below, the opamp is ideal, and i-v characteristics of the diode is given by I D = I S exp ± V D nV T ² , where I S = 14 nA , n = 2 and V T = 25 mV . (a) Find the small-signal transfer function T ( s ) = v o ( s ) /v i ( s ) . (b) Sketch the magnitude Bode plot of T ( jω ) . (c) Find V o ( t ) for v i ( t ) = 0 . 1 sin(2 π 1000 t ) . (d) Verify your results using Pspice. For the diode, use the model D1N4002. Provide schematics and all necessary plots with measurements. 10u C 1 1k R 1 +-V x 2 500 R 2 U 1 D 1 +-v i V o...
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