Sine wave signal source with stable output

Published:2011/7/28 3:24:00 Author:Ecco | Keyword: Sine wave , signal source , stable output | From:SeekIC

Figure shows the sine wave signal source with stable output. First using of an op amp comparator could produce a constant 60Hz square wave. The output end of comparator is connecting to a pair of 6.2V back connecting zener diodes. The following is a two-stage Sallen-key low pass filter, which canfilter out all harmonics. Capacitive coupling amplifier cuts off the DC component produced by zener diode which is not equal in circuit, it also make compensation for filter loss, and the precise calibration of the output amplitude can reach l0V peak. The result is that it gets a high stable 60Hz sine wave voltage with low distortion. In the case of constant ambient temperature, power supply voltage range is 90 ~ 135V, the sine wave output voltage rate of change is less than 5mV.



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