Circuit of Sine wave Oscillator with Ajustable Frequency and Constant Amplitude

Published:2011/5/25 4:25:00 Author:Joyce | Keyword: Sine wave, Oscillator , Ajustable Frequency, Constant Amplitude | From:SeekIC

As shown in the figure is the circuit of sine wave oscillator with ajustable frequency and constant amplitude. This circuit constitutes of a two-stage phase-shifting circuit and a one-stage linear inverting amplifier, which are connected in series. And the phase-shifting circuit is composed of integrated operational amplifier A1, A2 and RC. Because the phase shift of inverter A3 is 180o, the two-stage phase-shifting circuit should also have a phase shift of 180o to ensure that it can meet the overall phase shift of 360o required by the oscillation. The dynamic resistances of diode D1, D2 are quite large when the voltage is low, so the gain of the inverting circuit composed of As is high to make sure the starting of oscillation of the circuit. Oscillation frequency of the circuit is:



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