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Recent content by wangwang96

  1. W

    How to measure the propagation delay of comparator by hspice

    same to topic
  2. W

    about bandgap TC curve being concave instead of protruding

    tc curv somebody can help me to solve the problem,thanks!
  3. W

    Oscillator design, need some help, freq 40 Mhz, curr 60uA

    Re: Oscillator design help Yes ,the RC type oscillator is a good choice,but the bandwith of comparator is a issue(36MHz),if DC gain is 40dB ,then GBW is 40dBx36MHz,I think it is difficult for me to design the comparator.
  4. W

    a simple BJT problems

    bjt problems I read the book of Gray and have a problem,if temperature increase,then Wb increase,beta will decrease because Wb increase,is it right?but from Gray's book,beta will increase if temperature increase,I am comfused about it?
  5. W

    Oscillator design, need some help, freq 40 Mhz, curr 60uA

    Re: Oscillator design help because the current is too small,the size of MOS is small accordingly,from siilicon results,the jitter of output frequency is too terrible,can anyone help me to overcome the jitter of clock?
  6. W

    Oscillator design, need some help, freq 40 Mhz, curr 60uA

    Re: Oscillator design help I designed the ring oscillator before,from silicon results,the jitter of output frequency is terrible,I am not sure it is OK this time.
  7. W

    about bandgap TC curve being concave instead of protruding

    tc curve Thanks mpig,I changed the resistor to ideal resistor,but the TC curve is stilll concave,I think if the BJT model has some problems?
  8. W

    Oscillator design, need some help, freq 40 Mhz, curr 60uA

    Re: Oscillator design help one transistor crystal oscillator? but we have no crystal to use
  9. W

    about bandgap TC curve being concave instead of protruding

    bandgap tc I have designed a bandgap and sweep the temperature curve,I found the temperature curve is concave,but it should be protruding according to theory,I am confused about it ,someone can explain it for me? thanks a lot!
  10. W

    Oscillator design, need some help, freq 40 Mhz, curr 60uA

    Oscillator design help Hi,everybody, I want to design a oscillator and the frequency is about 40MHz,the current is not more than 50-60uA,if use ring structure,the size of transistor should be small enough because the current is too small,but the stability maybe a issue,if use a PLL,the power...
  11. W

    Which structure to use for designing a 18Mhz oscillator?

    I want to design a oscillator with 18MHz output frequency ,the process is 0.18um,which structure can be used? thanks a lot!
  12. W

    how about the precision of ring osci?

    I am designiing a ring oscillator,but I am not sure the precision about it,the working condition is as folllow:all process corner&Temperature(-25--85 degree)&1.8v power supply with +-10% variation & external resistor with +-5% variation.the output frequency is 36MHz,who can tell me how is the...
  13. W

    Oscillator design help!

    I want to design a oscillator with 15MHz frequency output ,external resistor can be uesd,if I use tranditional RC oscillator ,the parasitic capacitor will affect precision of output frequency.if any other better structure ,please tell me,thanks a lot!
  14. W

    how to test comparator's propagation delay?

    a comparator circuit ,how to simulate propagation delay by Hspice or orher simulation tools? Thx!
  15. W

    Opamp problems with the ratio and current mirror

    Re: opamp problems again I think you can enlarge length of transistor to avoid short channel effect!
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