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on-chip envelope(or amplitude) detector

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freewing

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I want to detect the envelope(amplitude) of a signal V(t)= A(t)cos(2pi*f*t), where f=200Mhz and A(t) is a low-frequency signal (almost dc). The range of A(t) is about 1mV to 10mV. Is there any paper or book talking about such circuit? Thanks.
 

Nimer

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hi
just to ad to your information the thermal noise alone at the reciever side could typically be 25 mvolts not to mention other kind of noise , so your job is gonna be really difficult .

taking in considratin the frequency is in mhz region ............

hope you succeed , i'll look in this subject .........


best regards
 

freewing

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Hi Nimer,
Thanks for your comments. Where does the 25mV thermal noise come from? The signal I'm talking about is from on-chip circuit, not from the wireless communication. The bandwidth of A(t) is as small as 1KHz. So actually the integrated noise is not that much.

Added after 58 minutes:

quadrature mixer can be used to get the amplitude. But I want to know if there is any simpler on-chip detection scheme?
 

walker8764

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Maybe you can consider the Log amplifier.
 

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