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Recent content by Anton89

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    Network analyzer calibration for RF test points

    Hello everyone, I have used some RF test points to characterize the RF components of a S-band receiver prototype. The part numbers are: MS-156C3 for the RF test points; MS-156-HRMJ-H1 for the plug (the mate-connector). Since I would like to measure the S-parameters, I need to use a calibration...
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    How to distinguish the electronic design approaches?

    Hello everyone, I realize the title is not so clear. Let me explain better my question. I have designed a radio-frequency receiver using different single components (LNAs, mixer, PLLs, filters, etc). I put together the components, defined the architecture and simulated the system. Each...
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    Is it important to design to 50 ohm even the digital lines (for example SPI lines)?

    Hi everyone, on my RF board there are both analogue lines and digital lines. On analogue lines there is a RF carrier. That lines have been designed to have 50 ohm characteristic impedance. Regarding digital lines, what should I do? In my case, there is a SPI to program a PLL. Do these lines have...
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    Issue regarding distance between a stripline and power via-hole

    Hello everyone, in our project there is a stripline close to a via-hole trought which we bring a 3.3V voltage to board. The via-hole is 3.5 mm far from stripline. On stripline there is an analogue carrier at 390 MHz that has a rms power minor than 0 dBm. Can the distance between stripline and...
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    Measure of jitter and phase noise on a square wave does not match

    Hello everyone, I have done a measure of jitter and phase noise on a square wave, but two measures do not match. In detail, I've measured the jitter with an oscilloscope and the phase noise with a spectrum analyzer, exploiting a special feature of the instrument. By a post-processing...
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    Is there any reasonable justification for not using via hole to route RF signals?

    I'm designing a RF trasmitter. However, the via issue is at 500 MHz frequency, a very low frequency to bring to light this problem (in my opinion). Anyway, my question is very general. I want to understand why I should not use the vias to route RF signals. I think it is very complicated to use...
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    Is there any reasonable justification for not using via hole to route RF signals?

    Hello everyone, I am a little bit confused regarding the use of via hole. My supervisor discourage me in using via holes to route a RF signal, but I didn't find in scientific litterature a justification. Moreover, nowadays there are several commercial electromagnetic solver which can help me to...
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    Relationship between power supply switching transient and the transmitted RF signal

    Hello everyone, we have an important issue about the power supply switching transient. We would like to understand if the switching transient of the power supply delivered to a RF trasmitter can cause the appearance of spurs in the RF spectrum at the frequencies multiple of the switching...
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    [SOLVED] S-parameters and total loss, calculation approach

    The lines are 0,26 mm width. The EM model contains the pads of the components, but actualy I do not know if this is taken into account also in the S-parameters of the components. I have made an assumption regarding the fact the S-parameters are de-embedded or not. In addition, I have not...
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    [SOLVED] S-parameters and total loss, calculation approach

    Hell Volker, thank you for reply. I'll try to describe a bit better the issue. The board has a reference ground plane under the RF lines. Each line links the output pin of a component with the input pin of the next one in the chain. I have simply placed a lumped port that has the positive on the...
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    [SOLVED] S-parameters and total loss, calculation approach

    Hello everyone, we have three cascaded RF components on an our transmitter and we want to calculate the total loss, taking into account the insertion loss of each components, insertion loss of the microstrips used for the layout and the mismatch loss between a component and the other one. We...
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    Calculation domain size for EM simulations - Does a rule of thumb exist?

    Hello everyone, if I wanted to study the edge effects of a PCB or the coupling between two micro-strips by line radiation, how large should the calculation domain be above the PCB? Does a rule of thumb exist? I need to simulate these effects in my EM simulator by time domain solver. Many thanks...
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    Routing a RF signal through PCB metal plane by via-hole

    It is not very clear the meaning of "TON" word. Are you talking about "via fence"? What is a rectangular notch? I did not understand what you have told me.
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    Routing a RF signal through PCB metal plane by via-hole

    The board is a receiver. The frequency before the downconversion is about 2 GHz, after about 400 MHz.
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    Routing a RF signal through PCB metal plane by via-hole

    Hello everyone, In order to solve some mechanical issues, we want to route the microstrips of a RF board through internal metal planes. We know that as general rule all RF signals must be routed on top metal plane with a underlying ground plane. Therefore, we do not know the consequence of a...
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