Digital Synchronous Demodulator for Measurement of Complex Amplitude Deviation
Considered demodulator uses periodic rectangular functions instead of conventional sinusoidal ones for calculation of Fourier coefficients defining complex amplitude. This allows considerable simplifying the demodulator design and increasing its operation speed. Specifically, the demodulator provides periodic measurement of phase and peak amplitude of narrowband signal in KHz frequency band of its complex modulation with effective amplitude resolution about 16-17 bits. The demodulator is mainly oriented to applications related to bio-impedance analysis under natural bio-modulation. Ill. 5, bibl. 2 (in English; summaries in English, Russian and Lithuanian).
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