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Linear_FM_detector

2017-03-14 21:02  
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Linear_FM_detector
Linear_FM_detector
This circuit uses an XR-2211 as a linear FM detector for a wide range of analog communications and telemetry applications. The demodulated output is taken from the loop phase-detector output at pin 11 (Fig. 3-9C) through post-detection filter RF/CF, and an external buffer/amplifier (which is required because of the high-impedance output at pin 11). Use any noninverting unity-gain op amp (chapter 10). The FM-detector gain (the output voltage change per unit of FM deviation) is: VOUT=R1 VR/100 R0 Volts/% deviation, where VR is the internal reference voltage (V+/2 -650 mV). The calculations given in Figs. 3-9 through 3-11 can be used to find the values for R1, R0, CD, C1, and CF.