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Recent content by tyassin

  1. T

    dc-blocking capacitor fro single-supply

    To be able to generate positive and negative swing the PWM centers around 50% duty cycle, so you have some non zero DC voltage. This needs to be filtered with a capacitor. In a dual supply the 50% duty cycle will Center around 0V and therefor no need for a capacitor.
  2. T

    coding question ( including port definitions )

    Hi Put the definition in a h-file. Then include this h-file in the top of every c-file where they have to be used.
  3. T

    [SOLVED] How important is S11 in a receiver antenna

    Hi It will be the same whether used as transmit or receive antenna. Also be aware that antenna loss can hide in the return loss. Meaning that loss will improve the return loss.
  4. T

    Locating Voltage Points

    There is also some errors with the polarity. In b) V_bc should be -9V and not 9V.
  5. T

    No need for ferrite bead.... just use resistor?

    Hi A 100R, 0603 resister is 100R at 100MHz. If you use FR4 then the wavelength is 1.41m at 100MHz and the resister is physically much smaller. There might be some small parasitic inductance of a few nH. I don't see the skindepth as an issue as the metal in the resister is properly thicker anyway.
  6. T

    RF Input power

    Yes sorry for the error and confusion. It is 0.707Vrms.
  7. T

    RF Input power

    Yes 0.5Vrms
  8. T

    Help in choosing correct bjt transistor

    I have misread the initial question....sorry. I thought it was to keep constant power from the power supply.
  9. T

    Help in choosing correct bjt transistor

    Hi Yes i see. But it semed like the OP wanted a circuit that could automatically adjust to keep the power constant, when changing the voltage upnor down.
  10. T

    Help in choosing correct bjt transistor

    Just a question....how is the attached circuit able to be constant power? I see only constant current.
  11. T

    Average current of sine wave

    Thank you for the answer. I am still not sure I follow. If I consider to calculate the average current(DC) for a sine wave (to get the power supply current), I follow the the equation given in (4.78) in my attached link. Then the DC component is calculated by integrating only the half sinewave...
  12. T

    buck converter output voltage ripple

    Hi I was wondering if these connection make sense. Especially the bootstrap capacitor. The only way it can charge is through the inductor and load.
  13. T

    Average current of sine wave

    Hi I have a question regarding the attached page from "RF Power Amplifiers". On the given page which deals with a class D amplifier, the average current or DC through the is calculated with the equation in (4.78). I dont understand why the result is the peak amplitude divided by pi? Should it...
  14. T

    Maximum average power (to calculate circuit)

    In #1 there is shown a current source.
  15. T

    Maximum average power (to calculate circuit)

    Hi I would say: 1. Remove the load ZL 2. Calculate the voltage over the removed load (40 ohm and the inductor). 3. Calculate the thevenin impedance when the current source is out (open circuit). What impedance does the Load see, two series branches in parallel. 4. Connect the thevenin voltage...
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