Lab6_Prelab - voltage stays the same? How much power will...

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Prelab 6: Biasing Circuitry Name: Lab Section: R 2 + V OUT - R 1 V CC Figure 1: Resistive divider “voltage source” 1. Consider the resistor network shown in Figure 1. Let V CC = 10 V, R 1 = 9 . 35 kΩ, and R 2 = 650 Ω. We can apply Th´ evenin’s equivalent circuit to this resistive divider to model it as an independent voltage source with an output resistance. Find the open circuit voltage and the output resistance for this resistive divider. - V OUT + R C I C V CC Figure 2: BJT voltage source 2. Now, consider a BJT voltage source such as the one shown in Figure 2. Pick the appropriate value for R C so as to achieve an output voltage of 650 mV. Let V CC = 10 V, I S = 26 . 03 fA, and V T = 26 mV. 1

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2 Ignore the Early efect For this calculation. 3. ±ind the power dissipated by this BJT voltage source as well as the output impedance. Hint: Recall the defnition oF power, P = IV . 4. IF we resized the resistors in the resistive divider (shown in ±igure 1) to achieve the same output impedance as the BJT voltage source, what should the values oF the two resistors be so that the output
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Unformatted text preview: voltage stays the same? How much power will the circuit now consume? R L-V OUT + R I OUT V CC Figure 3: Resistor “current source” 5. Consider the circuit shown in ±igure 3. Let V CC = 10 V and R = 10 kΩ. Roughly sketch I OUT vs. V OUT (space is provided on next page). Note: The specifc value For R L is not required For this analysis. 6. ±ind the short-circuit output current and the output impedance oF the current source. Note: R L represents a hypothetical load to the circuit; it can be replaced with an open-circuit For this analysis. 3-1-. 8-. 6-. 4-. 2 . 2 . 4 . 6 . 8 1 I OUT (mA) 10 20 V OUT (V) 7. For the current source, is it possible to increase the output impedance without decreasing the output current and without changing V CC ? Explain....
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This note was uploaded on 04/06/2009 for the course ECSE 2050 taught by Professor Monahella during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lab6_Prelab - voltage stays the same? How much power will...

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