|The larger capacitor charges and holds the voltage to make it appear that we have a negative resistance. It is the phase shift through the capacitor.
|In this shot I moved the reference to one side of R4 and measured across it. The floating ground allowed noise to display but the 50 ohm resistor is showing.
|Here I leave the reference at R4 and measure to ground to get the input Z. When I did the same measurement with a 1000u cap the reading was negative. The 100u cap show a positive reading. The RC time constant is determining the reaction to frequency.
|Back to the original circuit.
|Here we see the 50 ohm generator Z
|If I had Zgen = Zin I would read 50uv with the generator set at 100uv. How would I adjust that? Does it need adjusting?