# HW6 - HW6 PHYSICS 127A 2010 1(a You are measuring with a...

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V s R s = 10k Experiment 50 V o-scope V s 20k 10V in 50 V in R s = 10k Experiment 50 V o-scope (a) (b) 1. (a) You are measuring with a high-speed oscilloscope (with 50 input resistance) an experiment with a Vs = 1 mV voltage source and a 10 k source impedance. What is the voltage measured by the o-scope? Why is the voltage so small? (b) You now connect an amplifier between the experiment and o-scope. The amplifier has a gain of 10 , Rin = 20 k , and Rout = 50 . What is the voltage then measured by the o-scope? HW6, PHYSICS 127A 2010

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+10 V -1.6 V Vout Vin 1k 3. Emitter followers are supposed to have a gain of 1. In this problem, let’s calculate how close to 1 the gain really is. (a) Show that the gain of the following circuit is 0.99, assuming β = 100. (b) Now show the gain drops to 0.966 when you include the effect of the emitter resistor r e (in series with the base-emitter diode in the transistor). (c) What happens to the gain if you drop the lower voltage to -2.6 V?
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