Search:

Type: Posts; User: BigBoss

Page 1 of 20 1 2 3 4

Search: Search took 0.04 seconds.

  1. Closed: Re: Help with electromagnetic interference in Class E amplifier

    Class-E Amplifiers are naturally Switched Mode Amplifiers and they generate lot of harmonics due to its nature.
    The solely method is to reduce the Harmonics is using Optimum Output Stage and...
  2. Replies
    3
    Views
    235

    Closed: Re: [moved] Video transmitter for TV

    Yes, you can connect HDMI PC Output to CVBS Input of the TV by using MINI HDMI 2AV adapter.
    If the TV set hasn't got CVBS Input, you will have to buy RF Modulator to connect thru aerial antenna..
  3. Replies
    7
    Views
    265

    Closed: Re: Determining output impedance in LT SPICE

    gm=derivative(Ids/Vgs)(whilst Vds=constant)
    Obtain Ids vs Vgs and take the derivative of this curve..
  4. Closed: Re: Insertion loss reduction for matching networks in PA design

    If the Impedance Matching Circuit has been carefully designed, S11,GammaS,GammaL and S22 will all be zero (ideal case) so what rests ?? Just S21.
    But they won't be as expected in reality so you have...
  5. Closed: Re: Insertion loss reduction for matching networks in PA design

    No.. You're doing a serious mistake..
    If there is a Optimum Load Impedance to be matched to 50 Ohm, the Generator Impedance ( call it as Port-1) will absolutely be Complex Conjugate of this Optimum...
  6. Closed: Re: Insertion loss reduction for matching networks in PA design

    But this Insertion Loss is according to 50/50Ohm Terminations and if you change Optimum Load Impedance with Source Impedance, the Insertion Loss will be quite different.
  7. Closed: Re: Insertion loss reduction for matching networks in PA design

    -You presume that the PA has 50 Ohm Optimum Load Impedance right ?? But it's not practically true..Have you ever really found it as 50 Ohm ?? I don't think so..
  8. Replies
    7
    Views
    352

    Closed: Re: Broad band dsign of LNA best topology

    Follow the Textbook of Thomas Lee..
  9. Closed: Re: Keysight ADS ground connection in schematic not reflected in layout

    You have to use VIAs, no way out.Is there any other possibility to connect a Stub to GND in reality ?? No..
    So, VIAs are necessary..In order to simulate you layout only, you can place a Port to the...
  10. Closed: Re: Is it possible to eliminate harmonics when operated in compression

    You can filter them out..or you can also apply linearization techniques or you can use more linear device with an appropriate biasing.
  11. Replies
    7
    Views
    352

    Closed: Re: Broad band dsign of LNA best topology

    Distributed Microwave Amplifiers are also very popular for wide-band applications.
  12. Replies
    3
    Views
    312

    Closed: Re: Reflections when conjugately matched

    Researched in my literature and found very intuitive explanation about Power Waves and Scattering
    "Microwave Transistor Amplifiers-Analysis and Design"-Guillermo Gonzalez Section 1.7 pp:45-60
  13. Replies
    7
    Views
    352

    Closed: Re: Broad band dsign of LNA best topology

    Cascode Configuration is most common one.
  14. Replies
    4
    Views
    300

    Closed: Re: Finding Z21 using HFSS

    C(Farad)=1/{2*PI*Imag[(z11*z22-z12*z21)/z21]}
  15. Closed: Re: Current and degeneration resistor in input pair

    Degeneration Resistors improve the linearity,increase the Input Resistance that's all..
    There is no closed form equation for Calculation of Degeneration Resistors in Large Signal Mode.(there is just...
  16. Replies
    3
    Views
    207

    [SOLVED]Closed: Re: Resistors in Wilson current mirror

    They can also be used to achieve PTAT Current by well adjusting Resistor and Transistor Multiplication number..
  17. Replies
    3
    Views
    235

    Closed: Re: [moved] Video transmitter for TV

    Transmitting Digital TV Signal is not easy because it needs a IQ Digital Modulation and obtaining this IQ Digital Video Signal is not easy.
    On the other hand, creating old fashion PAL/SECAM/NTSC...
  18. Replies
    4
    Views
    300

    Closed: Re: Finding Z21 using HFSS

    If you know S-Parameters, you can transform them into Z-Parameters by using well known equations.
  19. 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...
  20. 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.
  21. Replies
    12
    Views
    518

    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...
  22. Replies
    12
    Views
    518

    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...
  23. Replies
    12
    Views
    518

    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...
  24. Closed: Re: Noise Figure budget analysis for power combiner & divider

    NF=Insertion Loss
  25. 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...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4