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Thank you that is very helpful information and it makes sense. So then the question becomes how to plot 2 of these baseband spectrums together, one at fc =0MHz +/- 10 MHz, and the other at fc = 20 MHz +/- 10 MHz. My plan was to generate two independent baseband signals and concatenate them to...
Thank you, I forgot the dot operator. I have added the following code.
fcMHz = 20;
fsMHz = 20;
t = 0:size(st)-1;
st2=st.*exp(1j*2*pi*fcMHz*t/fsMHz);
scatterplot(st2), grid;
My baseband signal still won't move from 0 MHz center. I can get the spectrum to shift by manually assigning...
Hi, in the below code I am generating a signal with a center frequency of 0MHz, +/- 10 MHz. I am wondering how to shift the entire spectrum to a center frequency of 20 MHz, +/-10 MHz (10 MHz to 30 MHz). What I am trying to do is take the final spectrum and multiply it by a complex exponential...
Thank you I will try that. I am trying to understand the exact purpose for the need to tune the feedback TX line that is tied to the FET gate. Is it the parasitic capacitance and inductance of the transmission line that contributes to resonant frequency, which is why the oscillator output...
Hi, I am trying to simulate a reflection oscillator with a frequency of 4 GHz. Attached is my circuit and simulation plots. From what I understand from reflection oscillators, the resonator frequency is far below the oscillator output frequency. Here, my resonator frequency is ~3.268 GHz...
Thank you for the response. Actually what I am looking to do is include other frequencies, not necessarily harmonics, into the original signal. I have a circuit which takes a frequency input and I suspect there are other parasitic frequencies imposed on the signal which is affecting the...
Hi, I want to do an AC analysis in PSpice but I want to include other harmonic frequencies, say 2nd and 3rd on top of the fundamental, rather than a single AC voltage source, and observe the output. Is this possible? I know it can be done in transient analysis by adding 3 sinusoidal voltage...
The sensor is not a VCM so there is no moving coil. The sensor is a solenoid. I am approximating the voltage generated by the solenoid (change in flux / change in time) as the source on the left side of the circuit. Could this back emf be causing resonant frequency change from sim to...
I have a magnetic sensor (coil, pole piece, magnet) which I am modeling with RLC. I believe the model can be similar to that figure. I have experimental data from the sensor (by passing gear by at a certain frequency) that I am trying to fit. RLC was estimated based on impedance measurements...
Thank you, actually I have since gathered more data and simulations. I am trying to match experimental data with simulated data and am observing characteristics I cannot explain. The schematic is a model of a sensor which is a coil of wire receiving magnetic flux and generating output voltage...
I want an asymmetrical Q. Almost like the inverse of the shape posted. I understand how to shift resonant frequency but not affect the symmetry of the plot.
Hi, I have the attached circuit and I am looking for information on what external components can be added to make the plot "fall" faster after the resonant frequency. Keeping all values the same, what other passives (RLC) can be added to make the response drop more rapidly and have a higher Q...
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