Sine-Wave Oscillator

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Sine-Wave Oscillator (TI)

Author : Ron Mancini and Richard Palmer


ABSTRACT
This note describes the operational amplifier (op-amp) sine-wave
oscillator, together with the criteria for oscillation to occur using
RC components. It delineates the roles of phase shift and gain in
the circuit and then discusses considerations of the op amp. A
brief analysis of a Wien-Bridge oscillator circuit is provided. Several
examples of sine-wave oscillators are given, although it is
recognized that there exist many additional types of oscillator to
which the principles of this application note also apply.


Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Sine-Wave Oscillator Defined . . . . . . . . . . . .  . . . . . . . . . . . . . . 3
3 Requirements for Oscillation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Phase Shift in the Oscillator . . . . . . . . .. . . . . . . . . . . . . . . . . . . 5
5 Gain in the Oscillator . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 6
6 Effect of the Active Element (Op Amp) on the Oscillator . . . . . . . . 7
7 Analysis of Oscillator Operation (Circuit) . . . . . . . . . . . . . . . . . . . 8
8 Sine-Wave Oscillator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1 Wein-Bridge Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.2 Phase-Shift Oscillator, Single Amplifier . . . . . . . . . . . . . . . . . . 14
8.3 Phase-Shift Oscillator, Buffered . . . . . . . . . . . . . . . . . . . . . . . 16
8.4 Bubba Oscillator . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 17
8.5 Quadrature Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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Sine-Wave Oscillator