![]() ![]() #QUCS NOISE VOLTAGE SOURCE SIMULATOR#The following four images are: (1) setup showing 180-degree on left, 90-degree on right, 0 corr for both sources, (2) results, (3) setup with corr of 1 for 180-degree and +j for 90-degree, (4) results Qucs (Quite Universal Circuit Simulator) is an open-source circuit simulator that offers support for a wide range of simulations, namely DC, AC, S-parameter, Harmonic Balance analysis, and noise. NOTE: This is a narrowband design, so it only REALLY works at the design frequency, which is 1.8GHz in this case. The imaginary portion as detected by the 90-degree hybrid is always zero no matter what coefficient I put in. Unfortunately, complex or purely imaginary correlation coefficients do not have the expected results. Here we have replaced the AC sourc with a voltage source generating pulses and. Measurement expressions come into play whenever the results of a 'Qucs'simula-tion run need post processing. #QUCS NOISE VOLTAGE SOURCE MANUAL#The results are as-expected for the 180-degree hybrid, meaning that when I add a real number to the correlation coefficient, the noise sources behave correctly. AC:AC1 Typelog Start1 Hz Stop10 MHz Points300 Noiseno. This manual describes the measurement expressions available in 'Qucs', the 'Quite Universal Circuit Simulator'. I was hoping to see the change in output power (which is proportional to the real and imaginary parts of the cross-correlation) as I changed the normalized cross-correlation coefficient. that generates high levels of transient noise at its frequency of operation. Anyway, I have a simple test set up where I have a correlated voltage noise sources object connected to ports 1 and 4 of a hybrid. When the RF field passes through an antenna coil, there is an AC voltage. I tested with ADS and got the correct results. In an AC simulation, the voltage probe appears to simply calculate the difference in total noise voltage between its terminals, which generally does not provide the correct result. This may not be the most standard way to test the correlation, but it works. This technique was first published by Scott Wedge in the early 90's if you're interested. Piecewise linear sources can take data from one of two sources. ![]() To simulate here, you have to enable the simulations (by selecting Edit>Deactivate/Activate and click. Use this source to create an arbitrary waveform as a set of voltages at various points in time. This can be accomplished with a 180degree hybrid (real part) and a 90degree hybrid (imaginary part). (switch is conducting and voltage source is disabled). I'm trying to test a few circuits that can separate the real and imaginary parts of the cross-correlation of two noise sources. ![]()
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