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  1. Z

    Idea for a compact mute switch

    Does someone has an exemplary layout or idea for a compact mute switch? One state low insertion loss and the other one for example a 30 dB rejection. Best regards
  2. Z

    Ferroelectric materials and applications?

    Ferroelectrics (BST-based) are claimed for tunable components in microwave: tunable filters, tunable phase shifters, tunable antennas, etc. Here some related links: http://www.paratek.com/ http://www.agilematerials.com/ http://www.ngimat.com/rf/index.html If you have more detailed questions...
  3. Z

    What is purpose use of SAW filters ?

    SAW filters are used today in mobile phones as RF preselection filters. Immediately after the antenna and switches, but before LNA. The goal is to preselect the system band and to improve blocking performance of the receiver. IF SAW filters are no more used, particularly in GSM cellular phones...
  4. Z

    Low-IF or direct upconversion transmitter

    how can I quickly test, if I have a low-IF RF chip transmitter or a direct upconversion. It is a 2.4/5 GHz Wlan with differential IQ input ports in baseband.
  5. Z

    What exactly is the MDR modulation?

    MDR modulation Someone knows what MDR modulation is?
  6. Z

    Why not a saw filter at the GSM TX side?

    I want to add that in GSM (half-duplex transmission) only a low pass filter is set after PA for harmonics suppresion. This could be realized by discrete components with low insertion loss (~0.5 dB). GSM RX-SAW has insertion loss > 2 dB.
  7. Z

    Why does the IP3 of LNA affect blocking performance?

    Re: Why IP3 of LNA? In the cellphone area, you can see it very well. (W-)CDMA, which are full-duplex standards, requires considerable more linear LNA than EDGE/GSM phones. Reason is because your own transmit signal acts as a strong blocker at your LNA.
  8. Z

    CMOS Receivers for Wireless Communications

    CMOS Receivers for Wireless Communications
  9. Z

    Single Rx and Tx filters instead of duplexer

    Hi vfone, first of all thanks for your reply. Yes, all what you say is clear for me. But my problem is that one guy have told me, that for example if we take the Rx part of a duplexer. it rejects around 55 dB your own Tx signal. But if you take this part and used it as a "stand-alone" Rx...
  10. Z

    Single Rx and Tx filters instead of duplexer

    In PCS-CDMA normally a duplexer (SAW, FBAR, ceramic) is used in mobile phones. But for example if you separate Tx and Rx antennas (or feed points) or even you have an additional Rx diversity path, single filters are required which take over the Tx-Rx-isolation functionality. But I heard that if...
  11. Z

    Prismark Wireless Technology Reports

    Hi, I'm searching Prismark Wireless Technology Reports.
  12. Z

    Tunable filtering in Intel´s radio free?

    I have surfed through the www. I have read some interesting things about "Radio Free Intel", It´s a kind of software defined radio for wireless devices. Here is an interesting abstract: "... the Labs are also looking into techniques that do most of their filtering in the phase-rather than the...
  13. Z

    the bandwidth defined in handset

    -5 to -6 dB are good values for handsets antenna bandwidths (S11)
  14. Z

    replacement for Varactor diode

    What is a step recovery diode?
  15. Z

    How to estimate the talktime of a GSM or CDMA mobile?

    Re: gsm-cdma talktime I know that the Pout vs. time plot for GSM mobile is very different from CDMA ones. GSM networks have a very slow power control. The average duration of a call is smaller than one would expect. I think, I have read something, which is little above of one minute...
  16. Z

    Question: how to reduce NF in a Receiver?

    First of all reduce losses before 1st LNA: 1.) insertion loss of preselection filter 2.) matching losses 3.) line losses Increase isolation of possible near-by transmitter. ...

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