Single-chip TRMS Power Measurement System AD8362 Demodulation Circuit

Published:2011/5/9 22:52:00 Author:Sharon | Keyword: Single-chip, TRMS, Power Measurement System, Demodulation | From:SeekIC

AD8362's UTGT side can constitute demodulation circuit. Take the envelope from the RF amplitude and restore it to the low and middle frequency signal before demodulation. The waveforms of the applied demodulation circuit and the process of obtaining envelope are shown in Figure (a), (b) below. It is assumed that the input signal is modulated 100kHz sine wave, and the carrier frequency is 100MHz. Link a voltage UT with an average of 1.25V, and 0.75V peak into the 14 feet, then the 12 feet's output voltage Uo is the 100kHz sine wave signal after its demodulation.



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