Implementing demodulation in a different way

Thread Starter


Joined Jan 6, 2004
I revisited the concept of demodulation of an AM signal.

Isn't the output of the 455 KHz IF filter, similar to a sampled signal as I could get from a DAC process?

If so (in the hope of not being wrong assuming the above) could I obtain the baseband just by using an active filter implemented with opamps of suitable GBW, surely very expensive/hard to find?

What are the flaws of my reasoning?


Joined Mar 14, 2008
There is no baseband signal in the 455kHz IF signal. It consists of the 455kHz carrier with sidebands at plus and minus the modulation frequencies around the carrier.