Unformatted text preview: Reading: Sections 7.1 - 7.5 Exercise 5.1: Do Exercise 7.1 from Chapter 7 of the textbook (page 390). Exercise 5.2: Do Exercise 7.3 from Chapter 7 of the textbook (page 390). Exercise 5.3: Determine the Thevenin equivalent of the following circuit. Note that it contains a dependant source. + i I R1 i R2 Problem 5.1: This problem studies the two amplifiers shown on the other side of the page. Amplifier A is a singlestage amplifier implemented with a voltage-dependent current source and a pull-up resistor. Assume that the current
S source parameters G and VT satisfy G > 0 and VS > VT > 0. Also assume that RG < -------------------- . Amplifier B is a two V VS VT stage amplifier in which each stage is identical to Amplifier A. (A) Determine vOUT as a function of vIN for Amplifier A. (B) Sketch and clearly label a graph of the input-output relation found in Part (A). (C) Determine vOUT as a function of vIN for Amplifier B. (D) Sketch and clearly label a graph of the input-output relation found in Part (C). (E) Consider Amplifier A again. Show that the dependent current source sinks power for vOUT > 0 and sources power for vOUT < 0. + - (F) Dependent current sources are most often implemented with transistors that are passive devices, and hence not capable of sourcing power. In this case, the dependent current source in Amplifier A would saturate so that vOUT actually never goes below 0 V. That is, the current through the dependent current source becomes con stant and does not increase with a further increase in vA once the voltage across the source reaches 0 V. Given this revised behavior for Amplifier A, sketch and clearly label a graph of the input-output behavior of Ampli fier B for very large G. Amplifier A VS R vin + vA
0 for vA VT G(vin - VT) for vA VT Amplifier B + + v + vout in Amplifier A Amplifier A vout - Problem 5.2: Do Problem 7.5 from Chapter 7 (page 396). Problem 5.3: Do Problem 7.9 from Chapter 7 (page 399). ...
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- Fall '00
- Amplifier, Thévenin's theorem, Voltage source, Norton's theorem, dependent current source