Type: Posts; User: BigBoss

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  1. Replies

    Closed: Re: Finding Z21 using HFSS

    If you know S-Parameters, you can transform them into Z-Parameters by using well known equations.
  2. Closed: Re: Wire bonding simulation in a low noise application

    If you are able to access CST license, use it to simulate the bond-wire.It will give you an quite accurate result.
    But bond-wire can show some deviation during manufacturing, therefore model it as a...
  3. Closed: Re: PN and jitter for low frequency oscillators

    You can do PSS+PNOISE Analysis but the accuracy won't be so good.Because the most difficult part of a modelization is to predict Low Frequency Noise components.
  4. Replies

    Closed: Re: 2SC1971 Amplifier problem

    -Screws have to touch to the GND if they are mounted on Top GND layer..( preferable )
    -If you will re-design the PCB, place numerous Top-to-Bottom VIAs and place them especially close to...
  5. Replies

    Closed: Re: 2SC1971 Amplifier problem

    There are many mistakes on your PCB layout.
    -You didn't use double sided PCB so Microstrip Lines have no sens at all..
    -GND Connections are very poor so decoupling caps and other stuffs have not...
  6. Replies

    Closed: Re: 2SC1971 Amplifier problem

    This is C-Class Power Amplifier and it shouldn't draw any current unless the Input Power reaches to sufficient level.
    So, since there is no RF signal at its Input, the quiescent current will be...
  7. Closed: Re: Noise Figure budget analysis for power combiner & divider

    NF=Insertion Loss
  8. Closed: Re: [Cadence ADE XL] Optimize a Common Source Amplifier to 15dB gain via Corner Analy

    You cannot find Optimum Vdc(in) in such a way..Here, you're changing Vdc(in) and obviously Vout is changing..
    Gain is another metric and specification.Look at Gain equation of this amplifier in a...
  9. Replies

    Closed: Re: HFSS vs. Momentum accuracy

    If a RF Structure has 2D or 2.5D, Momentum ( or equivalent ) is always faster and accurate.HFSS is a General Purpose real 3D FEM Simulator but it's slower and memory/cpu eager and it's not necessary...
  10. Closed: Re: Doubts regarding MMIC LNA design usingKeysight Technolo Advanced Design System (

    However the design techniques are quite different but Fundamentals are almost same.
    Here, in MMIC Passive Components are designed using with different metal and semiconductor layers.For instance, a...
  11. Replies

    Closed: Re: Reference for VCO and PLL

    This one is much more better for your 1.5GHz Reference.
  12. Replies

    Closed: Re: Reference for VCO and PLL

    In order to create a stable and clean reference another PLL can be used.Because Reference Signal for PLLs is very important and they have to be produced with Ultra low Noise and Ultra Stable...
  13. Closed: Re: Can you plot loadpull contour plots from impedance values ?

    Question is not clear or I didn't understand..
  14. Closed: Re: Difference in the reactive part between loadpull simulation and large signal spar


    You confuse a thing..
    Driving an amplifier naturally and finding internal source impedance ( The Impedance which is found by Load Pull max. Power Output ) is NOT same as driving this...
  15. Closed: Re: Deviation between simulation and measurement of matching circuits

    The influence of SMA connector can be neglected @ 2.4GHz.
    It has an influence over 10GHz and beyond..
  16. Replies

    [SOLVED]Closed: Re: RF Detector circuit design

    This circuit detects nothing but noise..
    You do very serious fundamental mistakes
  17. Replies

    Closed: Re: Receiver simulation in HFSS

    I believe how to obtain EM Field Distribution Contours in HFSS.They will give you an insight how much Electrical Field will be induced around your RX port.
  18. Closed: Re: Deviation between simulation and measurement of matching circuits

    There might be few variable that impact consistency of the electrical response.
    Manufacturing tolerances
    Component Tolerances
    Measurement Errors

    The results generally look not too bad but I...
  19. Replies

    Closed: Re: Bias sequencing card for GaN transistor

    -Connect the Load
    -Adjust Vgs to permissible min. value
    -Adjust Vds to wanted value
    -Connect RF Input (RF OFF)
    -Connect Vgs @min. and observe no Ids flows
    -Connect Vds @nom.
    -Adjust Vgs to get...
  20. Replies

    Closed: Re: GPS matching network confusion

    I believe that the manufacturer has assumed the IC will be used with 50 Ohm source impedance that's why a single inductor completes the matching for Lowest Noise.
  21. Replies

    Closed: Re: average value of as square wave


    thau:duty cycle
  22. Closed: Re: Plotting of VCO output power vs frequency in cadence spectre

    Sweep Vtune and look at Vout in dBm for first harmonic ( or whatsoever..) ..very simple.
  23. Closed: Re: Microstrip to layout in ADS for power amplifier design

    I said that use PDK of Cree, not model standalone..
    There will be DRC rules,LVS rules,and other stuffs such as VIAs,Transmission Lines,Resistors,Capacitors, etc. therefore PDK is a must..Otherwise...
  24. Closed: Re: When to connect RF Bypass capacitor, and a Resistor in place of RF choke?

    Depends on the frequency of operation.
    Resistors can be used because SRF of the Coils are very close or exceeds it.This is valid for capacitors too..
    Coil can be part of matching circuit.. It's an...
  25. Replies

    Closed: Re: how to get higher P1dB,in point

    It depends on the nonlinearity of the active device.Increasing bias current or playing with load gives a you a headroom to play in but it's not exact solution.
    For instance, if an active device has...
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