i need a lot of information about it the circuit contains
You can check e.g. https://www.electronics-notes.com/articles/radio/modulation/fm-frequency-demodulation-foster-seeley-detector-discriminator.php
https://wiki.analog.com/university/courses/electronics/electronics_lab_fm_detectors
Check out AM demodulator circuits and slope detection circuits...which is simply a bandpass filter preceeding the envelope or AM detection.
Source to get Impact factor of journals
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