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电路如图所示,采用2级反相积分器构成180°相移器。A_1作用是倒相,满足振荡条件: 采用积分电路的优点是高次谐波失真率以6dB/OCT的速率衰减,获得较低失真的余弦输出波形。运放A,、AZ和A3是基本电路,M:、M:、M3和M;为振荡稳定电路,但也可以采用其它形式电路。这里VCA(M3)采用模拟乘法器,电路简单,失真低。
The circuit shown in the figure, using 2 reverse phase integrator 180 ° phase shifter. The effect of A_1 is to invert to meet the oscillation conditions: Advantages of integrating circuits are that the higher harmonic distortion rate is attenuated at a rate of 6dB / OCT, resulting in a lower distortion cosine output waveform. The op amps A, AZ, and A3 are the basic circuits, M:, M:, M3, and M; they are oscillation stabilization circuits, but other forms of circuits are possible. Here VCA (M3) uses analog multiplier, the circuit is simple, low distortion.