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Recent content by crenyen

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    What will happen if WiMAX SSTTG and SSRTG are greater than 100us?

    Hi What will happen if WiMAX SSTTG and SSRTG greater than 100us? What factors will influence SSTTG and SSRTG? Thanks
  2. C

    Co-channel and adjacent channel rejection problem

    adjacent channel rejection Sensitivity w/o interference is OK. BER performances for high input power levels is OK. Thanks Cren Yen
  3. C

    Co-channel and adjacent channel rejection problem

    co-channel rejection I have co-channel and adjacent channel rejection problem in my WiMAX products with zero IF, build-in LNA in tranceiver and digital IQ. The receiving BER will be un-acceptable when co-channel and adjacent channel interference become higher. Can anyone have any idea about...
  4. C

    What is FPC connector ?

    Attached.
  5. C

    where to find part: 40.680mhz xtal

    Try to visit www.siward.com.tw or www.aker.com.tw or www.txc.com.tw you can find the XTAL you want.
  6. C

    Microstrip Filter design help

    If you have ADS simulation tool, you can use it to design u-strip filter.
  7. C

    I am going2day for an interview in WIMAX! plz help! urgently

    You got to know how to use VSA, SA, SG to test CPE TX and RX performance such as SNR, EVM, ACP, CINR, RSSI and so on.
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    What is the purpose of a 0-ohm resistor placed in a circuit?

    0-ohm resistor Sometimes we can use bypass capacitor to replace 0R resistor if DC blocking is taken into consideration.
  9. C

    Vector Network Analyzer

    VNA is an instrument that can be used to test RF circuits. Do you want to use VNA to test your circuits rather than design VNA?
  10. C

    designing a bandpass loww freq. filter

    The frequency is low. It sounds to me that your BPF design is used in ADSL / VDSL. Right? You can reference to some filter design book.
  11. C

    How to use VSA to measure WiMAX RX CINR?

    Hi Can anyone know how to use VSA to measure WiMAX RX CINR? Thanks
  12. C

    Low pass filter does not take effect

    Hi Experts In my WiMAX RF design, I used a low pass filter after power amplifier to remove 2nd and 3rd harmonic. Unfortunately, the LP filter doesn't take effect because it only can filter out 3rd harmonic by 20dB rather than 40dB which the LPF demo board can get. Does any expert know what...
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    Matching of SAW Filter with Differential I/O

    balun saw filter Trying to attach two baluns at SAW filter I/O port on my PCB is not easy. My idea is that I modify this 4 ports SAW filter to 2 port SAW filter by grounding another two ports then I can match it just like a common two port circuit with network analyzer. Does this method work?
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    wireless communication distance?

    Make sure your T/R switch is on TX path rather than on RX path when you are tring to transmit power to another station.
  15. C

    Matching of SAW Filter with Differential I/O

    how to do matching of saw The I/O differential impedance of chip set is 50 ohm. While the I/O balanced impedance of saw filter is 100 ohm.
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