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First-order active phase shift oscillator(F007)

2016-08-22 02:44  
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First-order active phase shift oscillator(F007)
The chart shows the first-order active phase shift oscillator. In the circuit, A1 and A2 form the first order active phase shifter, and they form loops with A3. A3 is the inverting proportion amplifier, it has the effect of primary amplification, the gain adjustment is -l, the phase shift is π. D1, D2 are the regulator 2DW7C, they play the role of steady increase. According the conditions required for the oscillation, transmission coefficient | β | of the first order active phase shifter is 1. When the total phase shift is π, the circuit can oscillate, the oscillation frequency: f0 = 1/2πRC.