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  1. A

    Why input signal level is measured in dBm/Hz?

    I saw a datasheet indicated the input signal level is -173 dBm/Hz. Why dBm/Hz ? Could someone please kindly advise and thanks.
  2. A

    antenna troubles, pls help!!

    Did you use any matching circuits in Tx path including PA & antenna matching ? Try to move shunt components and test it again.
  3. A

    antenna troubles, pls help!!

    shut off ? Can you describe it more clear ?
  4. A

    Sensitivity spread in Crystal unit

    What dose "senstivity spread" mean in crystal unit ? Thanks.
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    What's the difference btw series/parallel resonant crystal

    Re: What's the difference btw series/parallel resonant cryst Am I right ? There is only one type of crystal. Just depend on how you used it : series resonant mode & parallel resonant mode In series resonant mode, the specified CL of crystal can be ignored In parallel resonant mode, CL should...
  6. A

    What's the difference btw series/parallel resonant crystal

    Re: What's the difference btw series/parallel resonant cryst I'm still confused about series type & parallel type. Can someone explain in more details ? or provide some documents ? Thanks for your help.
  7. A

    What's the difference btw series/parallel resonant crystal

    Re: What's the difference btw series/parallel resonant cryst I saw an article which is said: ===================================================== "All quartz crystal resonators have a series resonant frequency (fs, frequency of lowest impedance). At this frequency, the crystal appears...
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    What's the difference btw series/parallel resonant crystal

    parallel resonant crystal I don't understand what's the difference btw series resonant crystal and parallel resonant crystal ? Are they the same in crystal manafacture ? In what application I need series one and in what application I need parallel one ? Thanks for your kindly advice.
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    Looking for manufacturer of VCXO with range from 50 to 80m

    Re: about VCXO need help Vfone According to the description of article, "It's important to note here that there's no difference between a series and a parallel crystal, only where it is calibrated by the manufacturer" Who is the manufacturer here ? Crystal manufacturer or product...
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    What does it mean that TI/DVB-H chip use digital RF ?

    Re: Digital RF ? Using digital technique to implement RF circuits. For instance, use directly sample circuits instead of conventional mixer. DSP technique can do a lot of post-processing.
  11. A

    Looking for fundamental theory and design of Xtal oscillator

    Xtal oscillator Can someone provide fundamental theory & design of Xtal oscillator ? Thanks a lot.
  12. A

    please mention the names of RF receivers used for Antenna??

    Re: please mention the names of RF receivers used for Anten you need discrete part or IC ? For what application?
  13. A

    Is there any SAW philter that has a wideband response?

    Re: SAW filter [hlp] What application you need for such a wideband with SAW filter ?
  14. A

    How to calculate matching loss

    I would like to know how much power is lost on matching network when you design a matching. Could anyone advise how to calculate matching loss? Thanks a lot.
  15. A

    What does Balun mean and why we use it ??

    Re: what's Balun ?? Hope these are helpful.
  16. A

    Why does CMOS not a good choice for PA design ?

    What is the limitation & disadvantage ? Thanks a lot.
  17. A

    Downconverting in receiver architecture

    Receiver Architecture From traditional recever(2 stage downconverting) to modern receiver (1 stage downconverting, low IF or Zero IF) structure, what's the progress of design for this ? I mean why it can not just downconvert the freq from RF to Zero-IF in the past instead of using 2 mixers...
  18. A

    What does "bandgap" stand for ?

    Thanks. May I know what the main function of bandgap is in the chip ? Is it a voltage reference(for comparison) or voltage source in the chip ? Thanks a lot.
  19. A

    What does "bandgap" stand for ?

    I saw a block called "Bandgap Voltage" from a transceiver datasheet. Could any expert advise what the function it is? Thanks a lot.
  20. A

    Noise Figure in blocking conditions

    Can someone instruct what it means ? I saw it from transceiver datasheet for cellular phone.

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