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Recent content by baoer

  1. B

    Current Steering DAC In Continuous Time Sigma Delta ADC

    Anyone who done Current Steering DAC before, help me plz Best regards
  2. B

    help for gm-c integrator

    i use the matlab to simulate the integrator. that's why i said , output should over the '0'.
  3. B

    help for gm-c integrator

    Dear oxide: try to decrease the signal frequency at 1Mhz , but it become worse, theoretically the output shoud all above the '0', but it is not ,i also accpet your opinion, the stability in small signal does not mean large signal will stable. i ask my friend, no one to see the large signal ...
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    Current Steering DAC In Continuous Time Sigma Delta ADC

    Dear eveyone: it is my architecture of my CT SDM and this is the DAC i will used. my problem is how do i calculate my Idac, when my feedback gain is 1.5 and capacition of Gm is 0.5pf, when fs=1Ghz. what's region does M1 and M2 operate, saturation or triode??why?? thanks very much.
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    help for gm-c integrator

    Dear oxide: this is my OTA with CMFB simulation,that is al i can find the best Vocm. The following is my only OTA simulation. The gain and phase margin is almost the same, the Vocm become better, but i can't loak it at the Vcm=1.65.why???but my all Vout=(vout+)-(vout-) shift toward to up...
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    help for gm-c integrator

    excuse , common mode loop mean CMFB???do i simulate only CMFB(not with the OTA) block to see the gain and phase??? i have the CT CMFB, but , it work bad, i don't know why? all transistor is operate in saturation. that's my Vocm=((vo+)+(vo-))/2, and my Vcm=1.65v and my bias is not ideal...
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    help for gm-c integrator

    gm c integrator fs=(gm/C)=0.4E9, input signal 0.3V, signal frequency 10MHz, .tran 0~3.072u. Thanks for your help , but i still have no ideal ,why???
  8. B

    help for gm-c integrator

    gm-c integrator hi everyone, i got a problem with my integrator, my OTA has the 50db gain and 80 phase margin, but it doesn't work like matlab simulation. The simulation should above the 0, but it decade down, why???? Does someone help me to solve this problem, plz.
  9. B

    Excess loop delay in continuous-time sigma-delta

    this is very useful for excess loop delay.
  10. B

    continuous time sigma delta

    could you post your simulink file of CT SDM, and we can find why?
  11. B

    Help for 3rd order continuous time sigma delta[10 points]

    Re: Help for 3rd order continuous time sigma delta[10 points you can use the zoh(zero order holde) in front of quantizer.
  12. B

    continuous time Sigma delta parameter extraction

    you can care about jitter and excess loop delay.
  13. B

    The 3-rd order continuous-time sigma-delta ADC

    can you post your architecture of integrator??? I guess your Vgst of source current is too small. MSN:baoerking@giga.net.tw i hope i can discuss this topic in MSN.
  14. B

    Plz,someone help me to find this paper???(sigma delta A/D)

    Schoofs R., Steyaert M., Sansen W., "Analysis of Gm G and RC filters for high-speed continuous time sigma-delta A/D conversion", in proceedings of International Symposium on Signals, Systems, and Electronics, Linz, Austria, August, 2004 Thanks
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