SQUARE_TO_SINE_WITH_PLL

Published:2009/7/6 21:19:00 Author:May | From:SeekIC

8038 Wavefrom generator simultaneously generates synthesized sine wave and square wave. Square-wave output closes phase-locked loop through 741 opamp IC2 and dual flip-flop IC1, while sine-wave output functions as converted output. Center frequency is 0.15/R9C3. R10 should be at least 10 times smaller than R9. If center frequency is 400 Hz, capture range is half that or ±100 Hz. When input is applied, phase comparator generates voltage related to frequency and phase difference of input and free-running signals, lC2 amplifies and offsets phase-difference signal. Sine output has less than 1% distortion, DC component of 0.5 Vcc, and minimum amplitude of 0.2 Vcc P-P.-L.S.Kasevich, PLL Converts Square Wave into Sine Wave, EDN Magazine, June 20, 1978, p 128.



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