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Recent content by katykaty03

  1. K

    Please help - PAE calculation

    Thank you! It's all because "I" is missing!. so i need to check I-V curve first
  2. K

    Please help - PAE calculation

    Hi all, I found a datasheet stated: PLoad(avg)=8W, Gain=14dB, Vds=28V, Vdq=170mA, PAE=40%, WCDMA mode Would you help me on the calculation how to obtain PAE 40%? **broken link removed** thanks!
  3. K

    A question about CATV related

    my company is designing a product. It's to transmit and receive CATV signal thru a 2.4GHz transciever system. This is a indoor home appliances. I don't know what kind of signal from CATV. Do I still add a TV tuner in my product? or it's already a demodulated video +audio signal? How can I...
  4. K

    GSM peak phase error - help

    I tried. the switching come from ramp down. I tried to tune but it just has little effect. Reduce the PA output power would help, but it just marginal pass on switching spectrum. it is fail on +400kHz. switching suddenly increase sharply when voltage below 3.7V. From 4.2V to 3.8V, all test...
  5. K

    GSM peak phase error - help

    I found that the phone has peak phase error and switching spectrum fail under low voltage (3.4V). It happend at maximum power level. I have checked the PA output matching, it's already very "matched". Actually I have tried to tune the output matching but no effect on this problem. any comment?
  6. K

    Question about FCC part15.247

    6db bandwidth 500khz I think so. but I am so confused of the word "minimum". I think they should remove this word
  7. K

    Question about FCC part15.247

    fcc part15.247 Dear all, I have a product using DSSS. If should fulfill FCC part15.247. However, I can't understand one of statement below. would you pls help? Part 15.247(2) ---quote-- (2) Systems using digital modulation techniques may operate in the 902 - 928 MHz, 2400 - 2483.5 MHz, and...
  8. K

    Help:GSM's phase eror

    hi guys, I also came across the problem of phase error. It happened on GSM band but not DCS/PCS. And some difference from yours is, the poor phase error at the beginning of burst only occur when battery drop to 3.4V. The situation is getting more worse when the phone operate in low temperature...
  9. K

    Labview - generate excel report

    Hi all, do anyone how to generate excel report using labview? Would you send me any tutorial or subVI about this topic? Thanks
  10. K

    measure impedance under large signal

    radiohead, while load pull at PA output, any effect on the input matching?
  11. K

    measure impedance under large signal

    Thank you for all of you. radiohead, how load pull method can help on this issue? could you explain more detail Thx
  12. K

    measure impedance under large signal

    I want to measure the input or output impedance of PA, under TX on. Is it able to do that?
  13. K

    measure impedance under large signal

    how to measure impedance anyone know how to measure it? under large signal transmission.
  14. K

    Does anyone know how to calculate the inductance ofmicrostip

    Re: Does anyone know how to calculate the inductance ofmicro As inductor is more expensive compare to cap, for cost down purpose, many product will try to replace the inductor with microstripline. But I think it's hard to control the inductance variation because of width tolerance, coupling...
  15. K

    Some information about Ultra Wide Band systems

    Re: Ultra Wide Band anyone know any chipset truely work on ultra wide band? how does it demodulate the signal?

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