TAILIEUCHUNG - Electronic Circuits - Part 2 - Chapter 11 Frequency Response

The need for operating circuits at increasingly higher speeds has always challenged designers. From radar and television systems in the 1940s to gigahertz microprocessors today, the demand for pushing circuits to higher frequencies has required a solid understanding of their speed limitations. In this chapter, we study the effects that limit the speed of transistors and circuits, identifying topologies that better lend themselves to high-frequency operation. | Electronic Circuits Part 2 Teacher Dr. LUU THE VINH 1 Behzad Razavi Fundamentals of Microelectronics 1st Edition 2008. 2 . Schilling Charles Belove Electronic Circuits Discrete and Integrated Mc Graw-Hill Inc 1968 1992 4 Robert Boylestad Louis Nashelsky Electronic Devices and Circuit Theory Prentice Hall 2008. 5 Lê Tiến Thường Giáo trình mạch điện tử 2 ĐH Bách Khoa 2009 Contents CHAPTER CONTENTS TIMES PAGE 11 FREQUENCY RESPONSE 9 537 544 13 OUTPUT STAGES AND POWER AMPLIFIERS 12 685 694 14 ANALOG FILTERS 6 721 731 15 DIGITAL CMOS CIRCUITS 6 775 786 16 CMOS AMPLIFIERS 6 0 829 Appendix Introduction to SPICE 6 817 909 SUM 45 0 Frequency Response FREQUENCY RESPONSE The need for operating circuits at increasingly higher speeds has always challenged designers. From radar and television systems in the 1940s to gigahertz microprocessors today the demand for pushing circuits to higher frequencies has required a solid understanding of their speed limitations. In this chapter we study the effects that limit the speed of transistors and circuits identifying topologies that better lend themselves to high-frequency operation. We also develop skills for deriving transfer functions of circuits a critical task in the study of stability and frequency compensation 12 . we assume bipolar transistors remain in the active mode and MOSFETs in the saturation region. Fundamental Concepts High-Frequency Models of Transistors Frequency Response of Circuits Bode s Rules J Bipolar Model 4 CE CS Stages Association of Poles MOS Model CBiCG Stages with Nodes Transit Frequency Followers Miller s Theorem Cascode Stage Differential Pair 1 Fundamental Concepts What do we mean by frequency response General Considerations What do we mean by frequency response Illustrated in Fig. a the idea is to apply a sinusoid at the input of the circuit and observe the output while the input frequency is varied. As exemplified by Fig. a the circuit may exhibit a high gain at low .

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