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Recent content by RFCMOS

  1. R

    How do I calculate an input impedance?

    equation to calculate the input impedance Hi You have already been given the formula to compute this impedance by dhavalelectron... regards,
  2. R

    difference between chip clock frequency (MHz) and radio

    radio clock chip Hi Nora, The microprocessor derives its internal clock (8MHz) from the crystal. The transmitter should contain a PLL (with VCO) that is used to translate the baseband data at 70MHz. I hope this helps. Best regards
  3. R

    Question about vout in circuit

    Hi Saeed, The circuit depicted in your drawing is a simple negative half wave rectifier. The circuit will pass the negative half of the input signal. In other words: when Vin>0, diode is reverse biased, Vout=0. when Vin<0, diode is forwad biased, Vout=Vin assuming ideal diode. regards,
  4. R

    FM/FSK demodulation using PLL

    phase locked loop fm demodulation Hi, Just browse google, you will find a lot of ressources....
  5. R

    Co-channel and adjacent channel rejection problem

    co channel rejection Hello, Usually, co-channel performances are mainly determined by the equalizer performances. Just to be sure about you set-up. Do you perform the measurements at system level? By system, I mean are you using a baseband...?
  6. R

    Checking VSWR using VNA

    Hello, Modern VNA are able to display VSWR vs freq. Otherwise, you can make S11 measurements and then use the following formula VSWR = (1+S11)/(1-S11) to deduce VSWR. Hope that helps. RFCMOS
  7. R

    Resistive power divider

    Hi, Are you looking for Resistive power splitters? Here is a link for very first introduction: Hope that helps. RFCMOS
  8. R

    Co-channel and adjacent channel rejection problem

    adjacent channel rejection, ber Hello, Is your reference sensitivity ok? What about the BER performances for high input power levels? RFCMOS.
  9. R

    ouptut power of a mobile phone ?

    Hi, Actually it depends on the standard used. The max. output power depends on the MS power class. In GMS900, most of phones are power class 4 and transmit 33dBm (2W) while they are class 1 in DCS1800 and transmit 30dBm (1W). For more data, check the 3GPP site in the section specification...
  10. R

    need help about RF power Amplifiers measure

    Hi yashiro32, check this link as short introduction: **broken link removed** Hope this helps. RFCMOS.
  11. R

    How to reduce the I and Q mismatch?

    Re: I and Q mismatch HI, mainly EVM degradation
  12. R

    Book: Guillermo Gonzales, Microwave Transistor Amplifiers

    Re: Book: Guillermo Gonzales, Microwave Transistor Amplifier Hello, Here is a link to the first ed. of the book: hxxp://dl2.s8.mihd.net/cgp9jdxt/microwave.transistor.amplifiers.analysis.and.design-0132543354.pdf Hope that helps
  13. R

    Differential with a function of time

    Re: differential Hi, You should consider practical examples to answer your question.
  14. R

    Power control in WCDMA

    Hello, You should to refer to the 3GPP standard. Have a look to the following link also: https://www.umtsworld.com/technology/power.htm Hope this helps.
  15. R

    how to find input and output impedance of the device

    hello Try the following link: https://www.rfcafe.com/references/electrical/s-h-y-z.htm hope this helps.
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