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Recent content by OMEsystem

  1. O

    Why an OTA can drive Switched-Cap circuit

    Why we don't need Op-amp to drive a sc circuit? The high out impedance can drive capacitor? How to explain this?
  2. O

    A problem of circuit theory

    We have an unkown tow-port ciruit. We obtain Z1, Z2, Z3, Z4 by open and short one of the port. Can we know the impedance of this circuit? Please see the attached.
  3. O

    Does ADC dc offset degrade its ENOB performance?

    adc dc offset We do observe input refered dc offset voltage of an ADC. I'm wondering does this offset voltage degrade ENOB?
  4. O

    Why do we use schmitt trigger as xstal oscillator buffer?

    oscillator schmitt trigger How come Schmitt trigger act as noise filter? Because of the hysteresis?Or..? Would you explain it in more detail? Thank you, Added after 5 minutes: Does pulse shaping mean correcting the duty cycle to 50-50?
  5. O

    Why do we use schmitt trigger as xstal oscillator buffer?

    schmitt trigger oscillator We can see some application material of xstal oscillator that they use a schmitt trigger to follow the oscillator. What's the reason behind it? For better noise? better interference immunity?
  6. O

    Why third order IM product slope is not 3?

    I measure the IP3 of a mos in triode region. I got a slope~2 IM3 rather than slope =3. What condition we will obtain the slope is not 3?
  7. O

    A question of QAM modulation using I and Q

    For Wi-Fi the transmitter send double side band signal or single side band signal? Thanks a lot.
  8. O

    A question of QAM modulation using I and Q

    So, the RF output of transmitter is not single sideband modulation? And, the Tx send a two uncorrleated signals which occupied the same frequency allocation?
  9. O

    why i/q downconverter or upconverter mixer is used

    Does the different signals of I and Q have any relation, such as phase delay but identical content? Or, I and Q signal from baseband are totally different in QPSK mode.
  10. O

    A question of QAM modulation using I and Q

    I would like to know the I and Q path in QAM modulation transimits identical information or not? or just have phase difference? Thanks,
  11. O

    Does tsmc provide inductor layout for ads momentum ?

    ads momentum inductor Does tsmc provide inductor layout for ads momentum ? I would like verify it by EM simulation using momentum.
  12. O

    Balun design in cadence spectre

    would you show me the web addres of these forums? Thanks,
  13. O

    I need s3p file of 1:2 balun for 2.4GHz freq

    I saw there is filter balun combination, is it a popular solution?
  14. O

    I need s3p file of 1:2 balun for 2.4GHz freq

    Who has the s3p file of 50 to 100 ohms smd type balun which operates at 2.4GHz? any datasheet or application are welcome to upload. Thanks,
  15. O

    Does S22 of power amplifier need to be matched to 50 ohms?

    Re: Does S22 of power amplifier need to be matched to 50 ohm But if we need to insert a band selection filter between PA and antenna. In case the filter is not matched, the frequency response would change, right? Is it a concern?
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