EE 330 Lect 31 Fall 2011

EE 330 Lect 31 Fall 2011 - EE 330 Lecture 31 Basic...

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EE 330 Lecture 31 Basic amplifier architectures
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Basic Amplifier Structures Common Source or Common Emitter Common Gate or Common Base Common Drain or Common Collector Common Input Output Common Input Output S G D E B C G S D B E C D G S C B E MOS BJT Can analyze the BJT structures and then obtain the characteristics of The MOS structure by setting g π =0 Review from Last Time
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Characterization of Basic Amplifier Structures D S G B E C Small Signal Transistor Models as 3-terminal Devices Observe that the small-signal equivalent of any 3-terminal network is a two-port Thus to characterize any of the 3 basic amplifier structures, it suffices to determine the two-port equivalent network How should the two-port characterization be done? Why is the two-port characterization useful? Review from Last Time
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Two-Port Characterization of 3-terminal devices D S G B E C Small Signal Transistor Models as 3-terminal Devices y 11 y 22 y 12 V 2 y 21 V 1 V 1 V 2 i 1 i 2 y-parameter characterization of 3-terminal network 1 11 1 12 2 =y +y i V V 2 21 1 22 2 =y +y i V V If unilateral, y 12 =0 y=parameters not widely used Review from Last Time
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Two-Port characterization of unilateral 3-terminal devices R oX V 1 i 1 v0 1 A V V 2 R iX i 2 Widely used characterization strategy Model parameters are {R iX , A V0 and R 0X } y 11 y 22 V 1 i 1 21 1 22 y y V i 2 V 2 Review from Last Time
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Two-Port characterization of non-unilateral 3-terminal devices R oX V 1 i 1 v0 1 A V V 2 R iX i 2 vR 2 A V Widely used characterization strategy Model parameters are {R iX , A V0 , A VR and R 0X } y 11 y 22 y 12 V 2 y 21 V 1 V 1 V 2 i 1 i 2 Review from Last Time
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The three basic amplifier types for both MOS and bipolar processes Common Emitter Common Base Common Collector Common Source Common Gate Common Drain How can the two-port parameters be obtained for these or any other linear two-port networks? Review from Last Time
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Methods of Obtaining Amplifier Two-Port Network 1. V TEST : i TEST Method 2. Write V 1 : V 2 equations in standard form 3. Thevenin-Norton Transformations 4. Ad Hoc Approaches R o V 1 i 1 v0 1 A V V 2 R in i 2 vR 2 A V VR 2 1 1 IN 2 2 O V0 1 = R = R + A A + Vi V V i V Two-Port Models of Basic Amplifiers widely used for Analysis and Design of Amplifier Circuits
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test in test R V i R o V 1 i 1 v0 1 A V V 2 R in i 2 vR 2 A V V test V out-test out-test VR test A V V test 0 test R V i out-test V0 test A V V R o V 1 i 1 v0 1 A V V 2 R in i 2 vR 2 A V V test i TEST R o V 1 i 1 v0 1 A V V 2 R in i 2 vR 2 A V V test V out-test R o V 1 i 1 v0 1 A V V 2 R in i 2 vR 2 A V V test i TEST test test : Vi Method for Obtaining Two-Port Amplifier Parameters SUMMARY If Unilateral A VR =0
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Consider Common Emitter/Common Source Two-port Models Common Emitter Common Base Common Collector Common Source Common Gate Common Drain Will focus on Bipolar Circuit since MOS counterpart is a special case obtained by setting g π =0
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Basic CE/CS Amplifier Structures R 1 V IN V OUT R M 1 V IN V OUT The CE and CS amplifiers are themselves two-ports !
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EE 330 Lect 31 Fall 2011 - EE 330 Lecture 31 Basic...

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