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Unformatted text preview: Prelab 5: Single Stage BJT Amplifiers: Common Collector and Common Base Name: Lab Section:- v in + C V IN R 1 V CC R 2 R S R IN R OUT + v OUT- R E Figure 1: Common collector amplifier with biasing network 1. What ratio of R 1 to R 2 is required if the input bias, V IN , is 5 . 65 V and V CC is set to 12 V? Note: R 1 and R 2 approximately forms a voltage divider that provides the input DC bias point (just in case you did not notice). Also, regard the current flowing through R S as negligible for this calculation only. In addition, recall that a capacitor is a DC open circuit. 2. Draw the small signal model for the common collector amplifier shown in Figure 1. 3. State (do not derive) the formulas for the input impedance ( R IN ), output impedance ( R OUT ), and voltage gain ( A v ) of a common collector amplifier. Note that the most general formulas should suffice because the biasing network can be modeled using the Th evenin equivalent circuit (i.e. a voltage source with one resistor in series)....
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- Spring '08