Ass2 - R L R = 1k V o V i L Fig 2 2 a Find V o with no load and V = 20V b Find the line regulation v o v with no load connected and deduce the

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1 ECED3201: Introduction to Electronics Fall 2009 Dalhousie University, Department of Electrical and computer Engineering Assignments #2 Problem 1 Consider V I =5V, v i (t)= 0.5sin 1 t (V), R 1 =1k , and R 2 =1k in the circuit shown in Fig. 1 Assume that the diode has I S = 6.95×10 -16 A, n=1, and V T =25mV. R 1 V I v i ( t ) v D ( t ) i D ( t ) + - + - + - R 2 v O ( t ) - + Fig.1 a. By doing dc analysis (the ac signal v i (t) is reduced to 0), find by iteration the dc current, I D , and the dc voltage, V D , of the diode b. Find the small-signal resistance (the ac resistance r d ) of the diode. c. Write mathematical expressions for the total instantaneous current i D (t) and the total instantaneous voltages v D (t) and v O (t). Problem 2 The diode zener in the circuit of Fig. 2 is specified to have V Z = 7.5V at I Z = 8mA. This zener has an incremental resistance r Z =20 and I ZK =I Zmin =0.5mA. The supply voltage V + is nominally 20V.
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Unformatted text preview: R L R = 1k + _ V o V + i L Fig. 2 2 a. Find V o with no load and V + = 20V. b. Find the line regulation ( v o / v + ) with no load connected and deduce the output voltage V o when the supply is 10% higher. c. What is the smallest possible load resistor R L that can be used while the zener operates at a current no lower than I ZK = I Zmin and while the supply V + =20V. Problem 3 Consider the half-wave rectifier circuit of Fig. 3. Let v S be a sinusoid with 15 V peak amplitude, and let R=1.5k . Use the constant-voltage-drop diode model with V D =0.7V. Fig. 3 a. Sketch the transfer characteristic (v O in terms of v S ) b. Sketch the waveform of v O c. Find the peak current in the diode d. Find the PIV of the diode. Due date: October 1, 2009 at 1:00pm. Late submission will not be accepted....
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This note was uploaded on 02/12/2011 for the course ECED 3201 taught by Professor Al-sankary during the Spring '11 term at Dalhousie.

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Ass2 - R L R = 1k V o V i L Fig 2 2 a Find V o with no load and V = 20V b Find the line regulation v o v with no load connected and deduce the

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