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The measured peak gain of my antenna is larger than the simulated one. Is it right? If the directivity is changed during processing and measuring, can the measured result be larger than simulated one due to the power concentration.
Hi everyone! Has anyone met the same puzzle? A strip can generate a frequency resonance, but a strip can also generate a band-rejection? Why can it have the extremely different applications?
I'm so sorry for not giving all the conditions. And a(s) is the transfer function of the amplifier in the figure. It is supposed to be a single pole transfer function which is a(s)=a0/(1-s/p1) . p1 is the pole of the amplifier and a0 is the DC gain of the amplifier. And thank you very much for...
For example, the pole of a(s)/(1+a(s)*f) is p1(1+a0*f) and p1 is negative. If the pole is in the left part of the s-plane, a0*f should be bigger than -1. So the criterion of system stability is a0*f>1. Do you think that equals to the loop gain criterion? Or there is something wrong with my...
Thanks for replying! However, is it easier to evaluate the loop gain for a stability check? I think the loop gain f need caculating. If the f isn't a constant but a variable of frequency, that's not easier than caculating the transfer function of the closed loop. And another problem is that...
Hello, everybody! I wanna ask a question about the stability about the negative feedback system, shown as the figure.
As the book of "Signals and Systems" said, if all the poles of a system transfer function are in the left part of the S-plane, the system is steady. So can I judge the...
A balun is used in my circuit to convert the differential ends to a single end to test the chip by network analyzer. The input impedance is too large cause the input is the gate of MOS. The R ratio of the balun is 1:1. How can I implement the impedance match? I have two kinds of configuration as...
Thanks! I want to use a balun to do that. However, the chip works in the IF part of the system and the work frequency range is 100k~2MHz. I don't know how to select a suitable balun. I want to use the products of Mini Circuit, but there are to many models. Could anybody introduce any experiece...
I want to use a network analyzer to measure my chip. The network analyzer has a single end input, but the chip has a differencial output. I want to know how to convert the differencial output signal to a single input signal. Do I need some devices? What are they?Thank you very much!
The poles of the biquad can be real or complex. Does the biquad with complex poles have more advantages than the biquad with real poles? Would somebody like to tell me? Thanks!
Hi, WimRFP
Thank you! I know the definition you referd to. Usually the definition is used in some papers and books. But I have seen another formula to caculate the phase noise which is described in the image I uploaded. I think the formula is used to derive the phase noise of a reciever when...
Hi, everyone! I see a formula about phase noise. I don't know the meaning of it and how it is derived? Can anybody give me any explanation? Or, please introduce some books or papers about the formula derivation. And the formula is presented as
sorry, I don't know how to upload an image.
Added after 38 minutes:
Oh, my god! I uploaded the image at last! And all the circuit is integrated in one chip. There are just five ports existing including the GND, VDD, OUT, Input1 and Input2 due to my less experiement. And when I contectted...
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