FSK_SINE_SQUARE_TRIANGLE_GENERATOR

Published:2009/7/6 2:40:00 Author:May | From:SeekIC

Exar XR-2206 modulator-demodulator (modem) is connected as function generator providing high-purity sinusoidal output along with triangle and square outputs, for FSK applications. Circuit has excellent frequency stability along with TTL and CMOS compatibility.Total harmonic distortion in 3 V P-P sine output is about 2.5% untrimmed, but can be trimmed to 0.5%. High-level data inputsignal selects frequency of 1/R6C3 Hz, while low-level input selects 1/R7C3 Hz. For optimum stability,R6 and R7 should be in range of 10K to 100K. Adiust R8 and R9 for minimum distortion.- Phase-Locked Loop Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 57-61.



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