Berkeley ELENG 105 - Lecture 14 (14 pages)

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Lecture 14



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Lecture 14

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Pages:
14
School:
University of California, Berkeley
Course:
Eleng 105 - Microelectronic Devices and Circuits
Microelectronic Devices and Circuits Documents

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Lecture 14 10 ANNOUNCEMENTS 38 Midterm 1 results undergrad scores only N 74 mean 62 8 median 63 std dev 8 42 You may pick up your exam during any TA office hour Regrade requests must be made before you leave with your exam The list of misunderstood forgotten points has been updated OUTLINE Frequency Response cont d CE stage final comments CB stage Emitter follower Cascode stage Reading Chapter 11 4 11 6 EE105 Fall 2007 Lecture 14 Slide 1 Prof Liu UC Berkeley 25 CE Stage Pole Frequencies for VA p in 1 RThev Cin 1 g m RC ro C p out 1 1 C RC ro Cout 1 g R r m C o Note that p out p in EE105 Fall 2007 Lecture 14 Slide 2 Prof Liu UC Berkeley I O Impedances of CE Stage Z in 1 r j C 1 g m RC ro C EE105 Fall 2007 Lecture 14 Slide 3 Z out 1 RC ro j C CCS Prof Liu UC Berkeley CB Stage Pole Frequencies Note that there is no capacitance between input output nodes No Miller multiplication effect CB stage with BJT capacitances shown p Y ro 1 RC CY CY C CCS p X 1 T 1 RS C X gm C X C EE105 Fall 2007 Lecture 14 Slide 4 Prof Liu UC Berkeley Emitter Follower Recall that the emitter follower provides high input impedance and low output impedance and is used as a voltage buffer Follower stage with BJT capacitances shown CL is the load capacitance EE105 Fall 2007 Lecture 14 Slide 5 Circuit for small signal analysis Av ro Prof Liu UC Berkeley AC Analysis of Emitter Follower v X vout v KCL at node X vout v vin vout v v v 0 1 1 RS r j C j C v v vout KCL at output node g m v 1 1 r j C j C L C R 1 j a S C C C C L C C L gm vout gm C R C vin a j 2 b j 1 b R C 1 S L S EE105 Fall 2007 Lecture 14 Slide 6 gm r g m Prof Liu UC Berkeley Follower Zero and Pole Frequencies vout vin C 1 j gm a j 2 b j 1 RS a C C C C L C C L gm b RS C C R S 1 gm r CL gm The follower has one zero gm z 2 fT C The follower has two poles at lower frequencies j j 1 a j b j 1 1 p1 p2 2 EE105 Fall 2007 Lecture 14 Slide 7 Prof Liu UC Berkeley Emitter Follower Input Capacitance Recall that the voltage gain of an emitter follower



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