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Recent content by Samy_75

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    Question on High Impedance (HZ)

    Hello, I have several question regarding HZ. 1. What does it means exatly when we say a pad is HZ? (in term of voltage current) 2- Could we directly connect two HZ pads without any specific care? 3- What if we connect a HZ pad with low or high level pad? Thanks for your help
  2. S

    What means by a1,b1 in S-Parameter?

    Hello CQCQ, a1,a2 are incident voltages and b1,b2 are reflected voltages, each being normalized by √Zo. Samy
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    need to measure the input impedance of a LNA

    Re: LNA measurement Hi kspala, When you say pad, you mean attenuator.....is it right? Thanks for ur help. Samy
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    need to measure the input impedance of a LNA

    Re: LNA measurement Hello Kspala, As you noticed, it is -80dBm and not 80dBm (typo error)...sorry for the inconvenience. Moreover, I confirm you that on the VNA, I use, the level of the power source can only be decreased down to -20dBm. Your help is appreciated. Thanks Samy
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    need to measure the input impedance of a LNA

    LNA measurement Hi Experts, I need to measure the input impedance of a LNA designed to amplify RF signals around 80dBm. However, the source of my VNA can only be decreased down to -20dBm. .....Any idea of how I can do this measurement? Thanks, Samy
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    Is the output waveform of a crystal oscillator always a sinewave?

    Re: Cyrstal oscillator Hi, No answer....Is my question too stupid?? I hope someone could help. rgds, Samy
  7. S

    Is the output waveform of a crystal oscillator always a sinewave?

    Hello, I have a very basic question: Is the output waveform of crystal oscillator always sinewave? Thanks, Samy
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    how to measure the frequency of crystal?

    how to measure frequency of a crystal Hi, Try to do what nguyennam explained or use a very low capacitive scope probe. I hope that helps. Samy
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    Please share RF Visio Stencil with me!

    Hi All, Can somebody share RF Visio Stencil? Many thanks. Samy.
  10. S

    LNA noise match and power match

    Hi, Noise match is the matching that minimizes the LNA NF.... and is usually different from power match. There is a trade-off to find
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    Ground loop in RF- request for resources

    Re: Ground loop in RF Hi Flatulent, Thanks for your help. You stated in your previous post: "No full circle routs with part of the signal path going left to right and then making a U turn to come back to the left." What could be the effects to proceed like this? (Noise coupling?) Thanks, Samy
  12. S

    Ground loop in RF- request for resources

    Ground loop in RF Hi, I need some information ( Application notes, book reference, article) about ground lopp and how to minimize then in RF domain. Thanks, Samy
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    How to derive the equations that rule the design of LC balun?

    Hello, I am newbie in the field of....... I want to learn how to derive the equations that rule the design of LC balun. I found this equation in several papers, but was not able to derive them from the circuit topology. I hope someone could help to this. Thanks, Samy
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