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You are trying to implement an analog PLL. The servo amplifier should accept error voltages at the output of the mixer, it requires a symmetric supply. Its ouput should be wide enough to cover the tuning voltage range of the YIG.
Have you worked on an analog PLL before? The first step should be...
You can try to combine the subblocks using a circuit simulator such as AWR. Import all s-parameters and construct combinations. Check whether the results are as expected. If they are not as expected, try to investigate how your blocks are sensitive to input/output impedances. Add attenuators...
Hi! I'm working on a delayline frequency discriminator setup to measure phase noise. I realized that my measurement results stay the same below 100 KHz regardless of how pure the input signal is (it is dominated by some other noise). I'm able to see expected results above 100 KHz.
The...
Consider that you are dealing with reflection coefficients on the Smith chart. Reflection coefficient involves forward and backward waves. If you go teta much away from a load, the phase of the reflection coefficient changes twice.
s2p file does have the phase information you are looking for. If you have the s2p file, just plot it in a tool such as AWR or RSPlot... There are options allowing you to see magnitue, phase, real part etc. Plot phase of s21, that's it.
The first thing to check AM distortion. Power supply ripple mostly manifests itself as AM modulation on an input. You can apply a single tone input and look for sidebands (at the ripple frequency and its harmonics) in the vicinity of the tone frequency in a spectrum analyzer. Consider that it...
It looks correct to me. If you excite the line differentially (two lines excited at 180 degree out of phase), the impedance you observe will be the odd mode impedance. Similarly, if you excite the lines in even mode (two lines excited with the same phase with respect to a third node called...
You need to follow in what direction the phase changes. Because propagation of a planewave in a lossless media(like your case) is nothing but a phase change. Here, either of y or z changes the phase. Therefore we can say that it propagates into some direction in between y and z.
Your LNA is able to deliver expected gain when it is terminated with an appropriate impedance (50 ohm, NA connected case).
What about input VSWR of your filter? It looks the VSWR there is not good.
The LNA starts to behave weird when the filter is connected. This may be caused by two things...
Mismatch is mismatch, it does not matter whether you are transmitting or receiving. How come it is considered in one way? According to reciprocity theorem, if you have a impedance disturbance causing a return loss in transmit direction, you will suffer from that in the receive direction as well...
Yes, you will observe the same amount of phase change.
See this post: https://www.edaboard.com/threads/down-conversion-reference-delay.335429/#post-1431130
I dont know very well.
You can start with calculating the s-parameters of the coupler first. Then, you may send 1 ∠0 into Port1 and solve for the reflected wave. Once you find the reflected wave, you can calculate the reflection coefficient and the input impedance.
By the way, the input...
If you observe a good VSWR in EM simulation, you are done. Because you have a coupled structure, you have even and odd mod impedances. Driving the ports with 90 degree shift is neither even nor odd mode, I do not know whether a analytical description is available, EM solution may be the only...
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