Hi to all newsgroup! Do someone use this demod developed by Analog Devices? I have evaluation board and I read datasheet, but I can't demod direct current... I tried many ways, like described in datasheet, but my eval board doesn't work correctly at 0 Hz.
Any suggestion?
Thanks a lot Dario
Dario-- What's your application? What analog information are you trying to extract? The datasheet states that this is a 50-100 MHz device, which doesn't include 0 Hz (DC).
I haven't ever used Analog Devices demodulators, but I've been seriously investigating them for a possibility in a low frequency (30-500 kHz) application. According to
I'm not 100% familiar yet with the inner workings of a demodulator, but I do know that you have to have an AC signal in order to demodulate it, right?
You also might check into devices like the AD606, AD8304/8307, etc. that are demodulating logarithmic amplifiers if you're interested in the amplitude only of your signal.
Good luck!
-Todd
Thank you Todd for your answer! I'm sorry because my question is not very clear...
I need to demodulate a DVB channel from 800MHz to baseband. I filter I and Q baseband signals with a DSP to delete adiacent channels and I send it to a decoder. The problem is that baseband channel lacks of zero Hz frequency, so SNR is very poor. If I choose a different demodulation frequency (to bring DVB channel to higher frequency, about from 1MHz to 9 MHz), the SNR ratio is very good.
So, in the ad8348 datasheet I read that it can demod a signal to DC, but I could not realise this... I tried several configurations, but Demod doesn't work.
Maybe a scheme is clearer... I hope to post it soon. Thank you for your answer again. Dario
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