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Lesson 10-RF Oscillators

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Agenda: Positive feedback oscillator concepts, negative resistance oscillator concepts (typically employed for RF oscillator), equivalence between positive feedback and negative resistance oscillator theory, oscillator start-up requirement and transient, oscillator design - Making an amplifier circuit unstable, constant |Γ1| circle, fixed frequency oscillator design, voltage-controlled oscillator design. | 10 - RF Oscillators The information in this work has been obtained from sources believed to be reliable. The author does not guarantee the accuracy or completeness of any information presented herein, and shall not be responsible for any errors, omissions or damages as a result of the use of this information. April 2012 2006 by Fabian Kung Wai Lee 1 Main References • • • • • • • • [1]* D.M. Pozar, “Microwave engineering”, 2nd Edition, 1998 John-Wiley & Sons. [2] J. Millman, C. C. Halkias, “Integrated electronics”, 1972, McGraw-Hill. [3] R. Ludwig, P. Bretchko, “RF circuit design - theory and applications”, 2000 Prentice-Hall. [4] B. Razavi, “RF microelectronics”, 1998 Prentice-Hall, TK6560. [5] J. R. Smith,”Modern communication circuits”,1998 McGraw-Hill. [6] P. H. Young, “Electronics communication techniques”, 5th edition, 2004 Prentice-Hall. [7] Gilmore R., Besser L.,”Practical RF circuit design for modern wireless systems”, Vol. 1 & 2, 2003, Artech House. [8] Ogata K., “Modern control engineering”, 4th edition, 2005, Prentice-Hall. April 2012 2006 by Fabian Kung Wai Lee 2 1 Agenda • • • • • • • • Positive feedback oscillator concepts. Negative resistance oscillator concepts (typically employed for RF oscillator). Equivalence between positive feedback and negative resistance oscillator theory. Oscillator start-up requirement and transient. Oscillator design - Making an amplifier circuit unstable. Constant |Γ1| circle. Fixed frequency oscillator design. Voltage-controlled oscillator design. April 2012 2006 by Fabian Kung Wai Lee 3 1.0 Oscillation Concepts April 2012 2006 by Fabian Kung Wai Lee 4 2 Introduction • • • • • • Oscillators are a class of circuits with 1 terminal or port, which produce a periodic electrical output upon power up. Most of us would have encountered oscillator circuits while studying for our basic electronics classes. Oscillators can be classified into two types: (A) Relaxation and (B) Harmonic .