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Recent content by zltogo

  1. Z

    Please help me about the pulse signal problem

    sorry for my mistake。the signal is modulated by a 1.38ghz cw + high speed pin swith which is controled by 100us，10% pulse。
  2. Z

    Please help me about the pulse signal problem

    thanks for your reply, 1,the PA is designed for 1.3-1.4ghz, for 1.3-1.36ghz, there is no problem, only 1.37-1.4ghz, the problem happens. The pulse is 100 us width,10% duty. 2,after the filter, there is a 40db 200W ATT, so it does matched to 50 ohm.
  3. Z

    Please help me about the pulse signal problem

    Hi all, I have a pulsed square wave need to be amplified to 200W, and after the Low Pass filter, its shape changed, not square any more, the shape becomes like below picture showed. Instead of good square shape, it becomes discontinued. https://obrazki.elektroda.pl/7407682500_1375542572.jpg Is...
  4. Z

    How to design a 200W cw 2.4ghz rf switch?

    Thanks for your reply. I think I have to give up.
  5. Z

    How to design a 200W cw 2.4ghz rf switch?

    thanks for your help！
  6. Z

    How to design a 200W cw 2.4ghz rf switch?

    thank you very much. That is really a good idea，but loss is little bit high for a high cw power.
  7. Z

    How to design a 200W cw 2.4ghz rf switch?

    Hi all, Could you help : How to design a 200W cw 2.4ghz rf switch SPDT? Thank you very much!
  8. Z

    Is there any one can introduce a good circulator?

    Thank you for your reply. Now I faced a problem is that, when Pout=200W cw, before circulator, the 2nd harmonic is -50dbc, but after the circulator it becomes -45dbc. Do you know why that happened? But at very low output power like 20W, the circulator gives a 20dbc compression for...
  9. Z

    Is there any one can introduce a good circulator?

    Hi, I want a 200W cw 1.7-2.2ghz circulator, and 2nd Harmonic suppression needs to be better than 25dbc@200W cw to reach -60dbc. Thanks!
  10. Z

    NXP Develops Industry’s First Full-Band UHF Doherty Architecture

    Yes, I have BLF888D on my desk already, which is under mass production now. The picture I posted is real, not a simulation. Here is a link, you can find the real test data: https://v.youku.com/v_show/id_XNTY3Mzg3NTI4.html - - - Updated - - - Yes, I have BLF888D on my desk...
  11. Z

    NXP Develops Industry’s First Full-Band UHF Doherty Architecture

    NXP Develops Industry’s First Full-Band UHF Doherty Architecture October 30, 2012 High efficiency and high bandwidth combined in new solution for digital transmitters Eindhoven, Netherlands, October 30, 2012 — Building on its leadership position in the digital broadcast market, NXP...
  12. Z

    Need a Low pass filter, pleas help!

    Hi all, I need a 30-50mhz low pass filter to filter 2nd and 3rd harmonics. Is there anyone know a company which can provide this kind filter? Specs: S11<-25DBC from 30-45mhz, Handle power> 150W cw. Thanks!
  13. Z

    GaN VHF Broadband Power Amlifier

    Hello Andrew77, For this kind application, in NXP website there is a 120W application note with BLF645 from 10mhz to 600mhz, maybe you can take it as reference. **broken link removed**
  14. Z

    NXP Kicks Off High Performance RF Design Challenge

    NXP Kicks Off High Performance RF Design Challenge Prizes worth $25,000 for most creative application ideas for RF power devices Eindhoven, Netherlands, January 10, 2011 – NXP Semiconductors N.V. (Nasdaq: NXPI) has now opened registration for its first-ever High Performance RF Design...
  15. Z

    See this interesting Pic

    Is there any body needs me to explain?
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