I have an issue with an LTSpice simulation and I'm not sure if the issue lies in the simulation setup or somewhere more basic.
The system is as follows: on the left, there is a Class E amplifier. In the center is an inductive link which I've used the T-model for (so instead of a transformer, I have that LM). On the right is a full wave rectifier, voltage doubler, and "load". The part that I'm interested in is middle-top: a buffer and envelope detector.
The issue is this: the signal entering and leaving that first order active LPF are identical. I don't know how this can be the case, as the carrier is 1 Mhz, the modulation is 50 kHz, and the LPF rolloff is ~110 kHz. See image below:
Can someone see how I've misconfigured the envelope detector? Thanks!