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Recent content by wqy1985

  1. W

    question about the gated clock in the multirate system

    I am designing a multistage multirate system. it has 4 stages. all of them share the same main clk. the filter stage's operation frequency is clk, the second stage's operation frequency is 8 times smaller than clk. so I design a counter in the stage 1. every 8th clk period, the stage 2 get a...
  2. W

    how to design a high performance paralell to serial module

    Hi all my paralell output signal frequency is 48khz, its width is 24 bits. it has to be converted into serial signal. what my question is how to design a paralell to serial module with verilog. Maybe I can realize it with FSM or a sinple shift-register. which one is better. and the...
  3. W

    question about the output of the sigma delta modulator

    ~~~~~,somebody help
  4. W

    question about the output of the sigma delta modulator

    waiting for the answer
  5. W

    question about the output of the sigma delta modulator

    I have a question about the out of the sigma-delta modulator. I read some references about the sigma-delta ADC. They say there need a high pass filer in the digital decimation filter in the ADC to reject the DC offset. But I don't know where the DC offset come from, and how to reject it. Is a...
  6. W

    question about the result of the output of the modelsim

    what I mean is if I apply a signed 4 bits sine wave(which is generated by matlab)to the filter, is the output a 24bits sine wave as well?
  7. W

    question about the result of the output of the modelsim

    This is the result of the filter using the testbench which is the matlab generate automatically
  8. W

    question about the result of the output of the modelsim

    This is the result of the filter using mytestbench
  9. W

    question about the result of the output of the modelsim

    I am studying a digital filter(used in a sigma-delta ADC). It is a multistage filter. I use the FDATool in matlab to generate the code of all the filter. And then I use the modelsim to simulate. But I can't understand the result(it looks like it will always increase(positive and negative...
  10. W

    Does the order of the CICCOMP matter in the matlab?

    i try it again in matlab2009a but the problem exists as before. Anyone knows the answer?
  11. W

    something about the Direct-Form polyphase FIR

    does anybody know~~?
  12. W

    something about the Direct-Form polyphase FIR

    Hi,all I just design a half-band filter in the matlab for elimatate the outband noise and decimate at a factor of 2.What the matlab generate is a Direct-Form polyphase FIR. I don't kown how the polyphase FIR work. What is the difference between it and the Direct-Form FIR. Is the frequency...
  13. W

    Does the order of the CICCOMP matter in the matlab?

    my matlab version is 7.1~~~
  14. W

    CIC filter design issue in MATLAB

    cic filter you are right. It is not at the -3dB. In my project, it is about -0.22dB.
  15. W

    CIC filter design issue in MATLAB

    designing cic filter in matlab the frequency response is determined by the R(decimation facor),N(the order of the CIC) and the M (defferential delay). the passband is determined by them~~~ is the passband edge is the at the -3dB ?
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