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DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

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OUTOUTPUTOUTGNDIC1BTL0847-5V+5V+5V+5VFROMSOUNDINC170.01uFCARD R19INGND4IC2LM565VOUTPLLFREQUENCYADJUSTVINININREFTCAPTRESVCON+VCC-VCCR1710k2357101698R141k1213R25kR45.6kC7C80.1uF0.0068uF+-+5V411-5VD11N914D2IC1DTL08414C50.001uFC9+5V-5V0.1uFC140.01uF1kC20.001uFR8100kR13100kR16100kSWITCHED-CAPCLOCK FREQUENCYADJUST109+-+5V411-5VR15100kC11120pFR185kIC1CTL0848+5VC18+R910uF<strong>OF</strong>FSETADJUST18.2kC120.1uFC13-5V0.1uFC19+10uFR110kR3100kR710kGAINADJUST+5V-5VC100.047uF15IC3MAX280FBCLK47 DIVRTOOUTV+V-2C30.01uFR10100kBOUT8R6100kR1168k32+-+5V411-5VR12100kIC1ATL0841R54.7kC60.01uF+5VC10.01uFC150.1uFC20+10uF56+-411-5VC40.01uFC160.1uFAGNDC21+10uF1N914Figure 6.18 This PLL-based FM demodulator is used to generate dc-coupled signals from frequency-modulated signals generated througha PC sound card. IC1D is a limiter for the input signal. IC2 is the PLL. The common-mode rejection of IC1C eliminates dc and high-frequencycarrier components present at the output of the PLL. IC3 is a fifth-order all-pole low-pass filter with no dc error used to remove residualcarrier-frequency signal components from the waveform desired. IC1A adjusts the gain of the circuit and removes any offset introducedby the preceding stages.275

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