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# HW6 - through the capacitor v and the voltage across the...

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PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW6 1 BJT’s and Computer-Aided Circuit Design HW7 : Friday, Mar 11, 2011 DUE : Friday, Mar 18, 2011 READ : Electronic Computer-Aided Design, Supplement to Lab Manual, Part 1 Lab Manual, Chapter 7 (read ahead) Problems 1. A car stereo claims to be able to deliver 100 W to each speaker. a. If each speaker has a resistance of 4 Ω and the amplifier’s maximum output voltage is limited by the auto’s generator voltage of 12 V DC, what is the peak power that can be delivered to each speaker? b. One way to increase the DC supply voltage is to use a “step - up switcher” as shown below at left. This circuit draws its power from a DC voltage supply, and produces a larger DC output voltage. Explain how this circuit works, by first focusing on the circuit at right below. For the circuit at right, sketch on aligned axes i. the pulsed voltage v p ; ii. the current i c through the transistor; iii. the current i L through the inductor; iv. the current i cap

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Unformatted text preview: through the capacitor; v. and the voltage across the capacitor versus time. Assume that before the pulses are applied at v p the capacitor is initially charged to v out (t=0) ≈ v in – 0.6 V, and use the simplified diode model discussed in lectures on diodes. (Hint: remember that the current through an inductor cannot vary in steps.) c. How does this behavior change when a finite load resistance is connected at the output? d. Briefly explain how comparator and oscillator in the circuit at left can be used to regulate the output voltage. (“Switching” power supplies are widely u sed in computers and other electronic devices; they can be powered from AC or DC sources, and multiple circuits in a single package can produce several output supply voltages.) PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW6 2 2. MOSFET in diode configuration. Supplement, Part 1. Practice Problem 2. 3. Stability of voltage follower. Supplement, Part 1. Practice Problem 3....
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