6.012 Microelectronic Devices and Circuits Tutorial #10 Problem 1 – Common Collector Stage 1. You are given a voltage buffer that is based on the common collector stage shown in the figur e below. It uses a current supply as shown and the signal source is a voltage. +2.5 V IS = 5x10−15 A βF =βo = 200 VA = 90 V + vs +−− 1 kΩ r= roc o 100 ΩiSUP vOUTVBIAS + − −2.5 V Figure T10‐1‐1 a) Find the value of VBIAS so that VOUT =0 V when ISUP = 500 μA b) Calculate the two port parameter Rin, Rout and Avo when analyzed as a voltage amplifier. c) Calculate the overall voltage gain, Av= vout/vs when the output is loaded as shown.MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and CircuitsSpring 2009 For information about citing these materials or our Terms of Use, visit:
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