I'm trying to build (in pspice first) a system to detect a modulated signal using an envelope detector. I'm first using the MULT part to act as the 'mixer' and then use a BJT amplifier to increase the signal voltage (I tried using a regular OPAMP but to no avail). I'm getting the amplifier signal fine, but when connecting the output to the envelope detector, the amplifier signal becomes very small. I tried putting a capacitor in series with the envelope detector which does return it to the original voltage level but then the peak-to-peak voltage is very small. Either way, the output at the envelope detector is useless. Is there something I'm missing here?
Thanks in advance.
Edit: here's the circuit
**broken link removed**
Thanks in advance.
Edit: here's the circuit
**broken link removed**