I am currently working on a project in which I have a modulated RF signal at a carrier frequency of 400kHz. The signal itself is fairly low voltage, and I need to extract it from the RF carrier. I was thinking about doing it using a simple diode + RC circuit envelope detector such as this one from here:
The problem with my current approach is that my diode's turn-on voltage is about .63V, but my signal is about 300mV p-p. Is there a simple way for me to DC-bias my signal to about ~600mV? That being said, is it wise to use an envelope-detector like to one I'm currently using for a low-noise application? If so, are there any other good alternatives you know of that would do well at demodulating?