Hello everyone, I have a specific question, but I know that there are people with experience here. I'm testing an envelope detector project with Mosfet with Xschem and Ngspice. Considering the conversion gain definition *(20*log(rms(Vout)/rms(Vin)))*, I created a scheme with a sinusoidal source at the input with frequency of 2.4GHz and amplitude varying with

foreach

loop. So, using transient analysis (

tran 0.41n 3u 0 4p

), I used

meas tran dorms RMS v(do) from=0 to=3u

;

meas tran dinrms RMS v(din) from=0 to=3u

and

let cg = dorms/dinrms

for each amplitude value. I would like to know if this simulation schematic that I created makes sense and its the best way for obtain this simulation.

this query reaches a complexity level where to give a tangible help it is probably better to attach the schematic file(s) :-)

Right, sir. These are the schematic files. As I needed the gain depending on the input, I used a loop and the simulation takes time.

Thank you , looking at it...

I appreciate your help @Stefan Schippers. I know this was a very specific query. Knowing that it made no sense to do the AC simulation, I was having doubts about this schematic that I used, with the aim of getting the output DC voltage for each input value. This circuit detects the envelope of an ASK modulated signal. Thank you very very much. 😃