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    Fd2d solver.

    Anybody have copy of fd2d static solver? It is freeware but the it's not available anywhere. If anybody have the software please share it
  2. A

    [SOLVED] Limiter diode should be ground or 50 ohm?

    if you connect to 50 Ohm then half of your power will go to load and half will dissipate
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    Working of the circuit at 95 MHz

    Hi , somebody please explain to me the working of the below circuit. It is placed in IF section of 95 MHz. -Akhil
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    Will band pass filters provide stability for the circuit ?

    Hi If i add band pass filters both input and output of the amplifier. Will the amplifier is stable for entire region except the pass band ?? . Adding BPF will reduce S12 and S21 in out band , will this lead to reduce the stability problem and provide more gain?? -Akhil
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    BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

    the portion 2 have some reactance so you cannot use real value component. If you have the PCB then find out the impedance at the pin by placing one pi at chip and one at SMA connector
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    Optional antenna placement

    place ufl connector on the trace which will reduce the extra stub. there is one Microwave Coaxial Connectors with Switch available with ufl size . The internally built-in mechanical switch separates the RF circuit and ANT circuit, so that the circuit can be measured without any mutual effect...
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    DC blocking caps selection for a Filter(Band pass)

    you can use around 200 pf capacitor, which provide around 0.8 Ohm impedance at 880 Mhz . in pratical there will be some parasitic resistance and inductance will comes across the component so you can use around 60-100 pf capacitor. if you have network analyzer you can plot the impedance on the...
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    RF SMD attenuator makes RF path and Ground short.

    what is the value of the attunator ?
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    power amplifier design input impedance

    If i want to change the VDS value to 32 voltage and maintain the 50 mA Ids then optimum load data given the datasheet will change ?
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    FDTD analysis of patch antenna using CST

    https://perso.telecom-paristech.fr/begaud/intra/MWS_Tutorials.pdf try the above link
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    power amplifier design input impedance

    now i matched the transistor and added one 6 Ohm resistor in series with the input. Now the transistor is conditionally stable. I matched the transistor for maximum power so is it necessary to get S22 less than -10 dB ?
  12. A

    power amplifier design input impedance

    i wrongly entered the impedance value in the simulator. Now i matched both in put and output, still the amplifier is not stable in that region. Can you help me to stabilize the transistor?
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    power amplifier design input impedance

    as per your comment i did the simulation. Still the stability parameter is not greater than one in 900 MHz. The input reflection coefficient is not less than -10 dB. Can you please tell me where i am wrong ?
  14. A

    power amplifier design input impedance

    i put it for conjugate matching.
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    power amplifier design input impedance

    Hi , i want to design a power driver at 900 MHz. For this application i chose NPTB00004 transistor from maccom. In the datasheet they provide optimum load impedance and optimum source impedance for maximum power. **broken link removed** I designed a matching circuit for input and output as...
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    One specific tag is not detecting is it a problem of antenna or other hardware?

    Hi, I designed one NFC antenna for NXP 7210 chip. as specified in the NXP antenna design guide i made the antenna and maching circuit with 70 Ohm impedance. Measured impedance data attached with thread. The nfc working in the frequecncy 13.56 MHz. All 13.56 MHz NFC tags are detecting execpt one...
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    Current flow in amplifier

    Hi all, In a case of Amplifier design, for AC blocking we add inductor in collector pin of the transistor. The basic Amplifier network is given below image. When voltage at the base node changes the current through the transistor is also changes, which means current pumps through the PDN is...
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    Block up converter Ka band

    Hi , in Ku band block up converter, The input frequency is 950 MHz to 1950 MHz . My question is the first harmonics of 950 MHz is 950*2= 1900 MHz. Which is in band of the system frequency . For Up converting if i fed the signal to the amplifier then the 1st harmonics will exists, i cannot...
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    FM modulator using PLL working ???

    Hi Fant, Why we need Two point modulation. If we only apply the message signal to Ref then the output frequency at the VCO will create FM modulated signal ,nah? -Akhil

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