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ECG FM demodulator circuit diagram

2014-11-04 15:02  
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ECG FM demodulator circuit diagram
The circuit is suitable for satellite to transmit the ECG with bandwidth in 0.5 ~ 50Hz or other medical data in electronic systems. Audio signal is used as FM signal source applied to the 1KHz voltage controlled oscillator: when the input is maximum, the oscillator frequency deviation is ± 40%. In the receiving place, the corresponding audio signal is sent to the input of 565 PLL. The loop error voltage on pin 7 contains the necessary, in addition, it also contains the DC components and high-frequency components which are not necessary.