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Recent content by chang830

  1. C

    The xtal spice model

    Dear all, I am designing the xtal oscillator which works in 4.897MHz and 6.7458MHz respectively. But I have no spice models. I contacted with the xtal producer, but they only gave me the ESR values. Would u pls. provide the equivalent spice models near these two frequency? Thanks a lot!
  2. C

    The function of the resistor connected to the gate of PM20

    Hi, would u pls. tell me the function of the resistor connected to the gate of PM20? Thanks in advance
  3. C

    One question on the possible impact on the circuit of SOP-8

    Hi, We have a RF receiver chip with die and we bording it directly on the PCB. The measurements is OK from the 5V to 2.4V supply. We also packged it with SOP-8 form. But the measuremsts shows that it is OK for the 5V to 3.3V. But below 3.3V, the sensitivity started to decrease and even failed...
  4. C

    System simulation in ADS

    Can anyone help me? Thanks a lot!
  5. C

    System simulation in ADS

    Hi, I am doing some system simulations with ADS. I used a D filp-flop in my system, but i don't how to model it in ADS. Would anybody shed some light on it? Thanks in advance
  6. C

    a question on the xtal osc deisgn

    Dear saro, Yes, we are happy to tell you we can make it work now! We have some misuderstandings on it previously. We are optimizing the circuit and will let you konw the progress. We realy appreciate your kindness. :-)
  7. C

    a question on the xtal osc deisgn

    Dear Saro, Sorry for my late thanks because I am trying the archetecture you advused in these days. Yes, it becomes the relaxation osc when the capacitor is not properly selected and the frequency depends on the RC instead of xtal. It is not expected in our case because it is used as the...
  8. C

    a question on the xtal osc deisgn

    Thanks for the useful reply. It does help me. I intend to add a large resistor(about 50MOhm) parallel with the xtal to provide this dc bias. What do you think? Any risks? Thanks
  9. C

    the xtal osc topology in RF receiver

    Hi, We are developing a RF rceiver. The reference frequency we used is 37MHz xtal osc. I want to know what is the topology of the xtal osc normally used in RF receiver? Is it same as the xtal osc design used in MCU? Thanks
  10. C

    a question on the xtal osc deisgn

    Re: a question on the xtal osc design Thanks for the reply! My question is where is the negative impedence if we connect their gates to their own drains? Thanks
  11. C

    a question on the xtal osc deisgn

    Hi We are deisgning a 35MHz xtal osc. The attached file is the schematic of the ciruit we used. It is a typical cross-coupled oscillator. The negative impedence anlaysis is OK. But I can not make it oscillate. Would anyone pls. tell me any wrong with the schematic? Is ithis topology suitble...
  12. C

    A question on the power spilitter

    Hi, flyhigh, I think you are tight. Attached figure is the actuaral circuit I saw. Attached another PDF file is an article about the Wilkinson power splitters. I agree with you that it is the Wilkinson powet splitter. But just as tyassin asked above. Where is the capacitors Cp in the fiugre? I...
  13. C

    A question on the power spilitter

    power spilitter Hi, I see some one used the attached circuit as a power splitter. It is ussd in a 900MHz RF system. I can not understand its principle. Would anyone pls. gives me some explainations on this circuit? Thanks in advance
  14. C

    RF front-end and the tuner are same concept?

    Hi, what's the difference between the RF front-end and tuner? I was a bit confused with them. Pls. help to clarify it. Thanks in advance
  15. C

    PSRR in DC is only -38dB- any ideas?

    Re: PSRR in DC Yes, it can give me the PSRR value, but did not tell me why it is so low? Abd it also can not tell me what's the leakage path? Any good method to help on ot? Thanks
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