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Recent content by zcr35

  1. Z

    About PLL Loop BandWidth....

    loop bw to locktime Mainstream newly designed PLL chips have linear phase noise performance of PFD. It's clear that in single loop, Fout=N*Fpfd. In @nanlog Device's phase noise floor calculation, like ADF4107, phase noise in loop BW: L(fm)=Inband phase noise floor(mainly depending on PFD...
  2. Z

    Phase noise after comb generator

    In my opinion, use PLL would be much better: smaller size, better out-band phase noise than Mr.sinatra's method. With a well designed PLL, there are less spur than frequency multiplication. At 4GHz, the componets are easily be found like Analog Device ADF4113 PLL chip and Hittite VCOs. Try it...
  3. Z

    Which RF simulator is Better ! ! !

    Why not try E@glew@re? it's a complete and fast and easy to use RF beginners and professionals. You can prove and fast your designs much better than @DS and others. I think the suites' circuits fuction and filter fuction is No.1 in simulation. I changed my soft from @DS to E@glew@re the first...
  4. Z

    Transistor for X-band oscillator

    Fujitsu also look at this: FHX13X, also some others suitable **broken link removed**
  5. Z

    Is Eagleware's "GENESYS better than MWO and ADS?

    Use them in your way I used them all. Gene$y$ is accurate and cheap, easy to use. AD$ is powerful but difficult for beginners. MWO is between the other two. Gene$y$ and AD$ in very accurate in microstrip circuits. All of them are suitable for lumped circuits. In system level, AD$ is...
  6. Z

    PIC MICRO RF WATT METTER SWR FIELD STRENGTH ALL IN ONE

    Sorry, where can I find it? Sorry, where is it?
  7. Z

    How to caculate the PLL filter?

    Have a look at this in National.com from NS, AN1001.pdf has some detailed calculation. do it yourself, or use EDA soft such as Eagleware/PLLSim :oops:
  8. Z

    How to calculate the tx noise?

    Why need it? In most cases, the TX NF is not important. So it's hard to calculate it than RX. :roll:

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