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### 3455HW02_Assign_Fall_2005

Course: ECE 3455, Fall 2008
School: U. Houston
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Word Count: 430

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ECE Electronics: 3455 Shattuck Section Homework 2 Due Date: September 8, 2005 Sedra and Smith, 5th Ed., Chapter 1: Problems 1.45, 1.46, 1.49, 1.50, D1.52, 1.58, Extra Problem 1, Extra Problem 2, Extra Problem 3, Extra Problem 4 Extra Problem 1. A compact disc (CD) player laser pick-up provides a signal output of 10[mV]pp and has an output resistance of 10[k]. The pick-up is to be connected to a speaker whose...

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ECE Electronics: 3455 Shattuck Section Homework 2 Due Date: September 8, 2005 Sedra and Smith, 5th Ed., Chapter 1: Problems 1.45, 1.46, 1.49, 1.50, D1.52, 1.58, Extra Problem 1, Extra Problem 2, Extra Problem 3, Extra Problem 4 Extra Problem 1. A compact disc (CD) player laser pick-up provides a signal output of 10[mV]pp and has an output resistance of 10[k]. The pick-up is to be connected to a speaker whose equivalent resistance is 8[]. a) Calculate the voltage that would be delivered to the speaker if the speaker were connected directly to the pick-up. b) Assume that the speaker needs 20[V]pp to deliver clear acoustical output. Design an equivalent circuit for an amplifier that would deliver this output when connected between the pick-up and the speaker. Extra Problem 2. An amplifier has been connected as shown below, with a signal source and a load connected. In addition, a dc voltage source (VF) and a resistor (RF) have been attached to provide feedback. Find the input resistance seen by the signal source with the feedback in place. Extra Problem 3. A device, shown in Figure 3.1, can be modeled by a current source in parallel with a resistance. The relationship between the current through the device, iX, and the voltage across the device, vX, is given in the plot in Figure 3.2. a) Find a model for the device that would be valid when current is in the range 1[mA] < < iX 5[mA]. This model must have numerical values for the current and resistance, and the polarities with respect to vX and iX should be shown in a diagram. b) A voltage source is applied across the device so that vX = 10[V]. Find the power delivered by the device in this situation. Remember to use lower-case variables for voltage and current. iX, in [mA] 6 5 iX + vX Device 1 5 6 11 vX, in [V] Figure 3.1 Figure 3.2 Example Problem 4. A circuit is shown in Figure 1. The equivalent circuits for amplifiers A, B, and C, in this circuit are shown in Figures 2, 3, and 4, respectively. Find and draw a single amplifier equivalent circuit that could be used to replace amplifiers A, B, and C. Numerical Solutions: 1.45 a) 8.26 = 18.3[dB]; b) 2.5 = 7.96[dB]; c) 82.6 x 10-3 = -21.7[dB] 1.46 Av = 39.2[dB]; Ap = 79.2[dB]; 7...

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U. Houston - ECE - 3455
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3 201.47 1.4399.5 8.000.51 0.4855.0 52.095.0 98.01 251.692 1.5439.831 8.6120.542 0.47161.0 59.098.0 100.0
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