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Unformatted text preview: Microelectronic Circuits SJTU Yang Hua Chapter 12 Signal generators and waveformshaping circuits Introduction 12.1 Basic principles of sinusoidal oscillators 12.2 RC oscillator circuits 12.3 LC and crystal oscillators 12.4 Bistable Multivibrators 12.5 Generation of a standardized pulseThe monostable multivibrator SJTU Yang Hua Microelectronic Circuits Introduction The two The two different different approaches approaches (1) (1) linear oscillators: linear oscillators: employs a positivefeedback loop consisting of an employs a positivefeedback loop consisting of an amplifier and an RC or LC frequencyselective amplifier and an RC or LC frequencyselective network. network. (Section 13.13) (Section 13.13) ( 2)nonlinear oscillators or function 2)nonlinear oscillators or function generators: generators: The bistable multivibrator(Section 13.4) The bistable multivibrator(Section 13.4) the astable multivibrator the astable multivibrator (Section 13.5) (Section 13.5) the monostable the monostable multivibrator(Section 13.6) multivibrator(Section 13.6) SJTU Yang Hua Microelectronic Circuits The basic structure of sinusoidal oscillators The basic The basic structure structure Amplifier circuit Amplifier circuit realize the energy control realize the energy control Frequencyselective network Frequencyselective network oscillator oscillator frequency is determined frequency is determined Positive feedback loop Positive feedback loop amplitude control amplitude control implementation of the implementation of the nonlinear amplitudestabilization mechanism nonlinear amplitudestabilization mechanism f i x x = SJTU Yang Hua Microelectronic Circuits Basic Principles of Sinusoidal Oscillator The oscillator feedback loop The basic structure of a sinusoidal oscillator. A positivefeedback loop is formed by an amplifier and a frequencyselective network. SJTU Yang Hua Microelectronic Circuits Basic Principles of Sinusoidal Oscillator Feedback signal x f is summed with a positive sign The gainwithfeedback is The oscillation criterion: Barkhausen criterion....
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This note was uploaded on 03/02/2012 for the course EI 207 taught by Professor Chengjianping during the Fall '10 term at Shanghai Jiao Tong University.
 Fall '10
 ChengJianping

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