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How to design envelope detector in analog IC?

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guest3

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envelope detector ic

The carrier frequency varies from several KHz to several Meg Hz, and the envelope is very low speed, kilo Herz and maybe even less. How do I design the
detector in analog? The signal is differential. Thank you.
 

jiripolivka

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As you do not indicate the power level, your detector can be either a simple diode with a 50-Ohm matching resistor at input, and a 100 kOhm load resistor at output. Such detector would need -10 to 0 dBm to operate well.
If you need to detect power levels from < -40 dBm, there are many "logarithmic" detector ICs by Analog Devices (AD83xx series), Maxim, Linear Devices, and Hittite.
I used some of them, AD83xx series often works from almost DC to >1 GHz. Check the specifications and request samples.

Concerning the differential signals, the AD83xx series has differential inputs; otherwise use a resistor voltage divider to get a single-ended input signal.
 

upvl

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Re: envelope detector ic

Dynamic range is a critical specification for envelope detector, which will determine the topology.
 

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