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First-order Active Phase Shift Oscillator Circuit

2016-08-06 12:18  
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First-order Active Phase Shift Oscillator Circuit
As shown in the figure is the first-order active phase shift oscillator circuit. In this circuit, the first-order active phase shift oscillator is composed of A1 and A2, which forms a loop circuit with A3.A3 is an inverse proportion amplifier, mainly responsible for amplification. The gain control of A3 is -1,and the shift phase is π.D1、D2 are voltage-regulator tubes 2DW7C which will help to stabilize the amplitude. In orderto meet the condition of oscillation, the absolute value of transmission coefficient βof the first-order active phase shift oscillator is 1. When the overall shift phase reaches π,the circuit would start oscillation. The oscillation frequency is: f0=1/2πRC.