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Recent content by happsky

  1. H

    How to know the delay of Mult_add ?

    sorry ,I can't find it.
  2. H

    synchronization or Asynchrony reading and writing SDRAM?

    module WR_RD_DSP16_clk(clk, DSP_ECLKOUT, DSP_ED, nWR, nRD, data ); input clk;//不同时钟域的clk input DSP_ECLKOUT; inout [15:0] DSP_ED; input nWR; input nRD; output [15:0] data;reg [15:0] data; reg [15:0] dsp_data; always @(posedge DSP_ECLKOUT) if(~nWR) dsp_data[15:0]<=DSP_ED[15:0]; else...
  3. H

    How to know the delay of Mult_add ?

    MULT_ADD U_MULT_ADD( .clock0(clk), .dataa_0(Ch_reverse[15:0]), .dataa_1(Ch_forward[15:0]), .datab_0(K_reverse[7:0]), .datab_1(K_forward[7:0]), .ena0(GATE), .result(sub_result[24:0]) ); reg [4:0] delay_GATE; always @(posedge clk) //Four clock of delay, How to know MULT_ADD'delay...
  4. H

    AD9744 input data format

    AD9744 has a "MODE" pin ，and datasheet explains: “Selects Input Data Format. Connect to DCOM for straight binary, DVDD for twos complement”[page 7]，also in datasheet says:“ The 14-bit parallel data inputs follow standard positive binary coding, where DB13 is the most significant bit (MSB) and...
  5. H

    Osillator test problem(shaking in the spectrum analyze)

    Dear jiripolivka and BigBoss: it is an VCO, how to take care of the DC supply, the DC supply is as shown below: is it a good supply? How to calculate the shaking frequency using this supply specification ? and the Kvco is about 1GHz/1V Line regulation ≦ 0.01% + 3mV Load regulation...
  6. H

    Osillator test problem(shaking in the spectrum analyze)

    Dear all An osillator is tested in a Spectrum analyzer,as shown in the picture,but the center frequency is shaking like that,the shaking bandwidth is about 2MHz ,why? is it the test problem or the circuit problem. Thanks in advance!
  7. H

    Rigid Waveguide Calibration Kits quentions

    Dear all,　I want to buy an equipment about waveguide calibration. But something I can't understand ,please help me to solve it,thank you! 1. what is meaning of "balanced phase respones" 2. why "λ/8 and 3λ/8 long offset" can replace "short" and "open", I think λ is frequency-depend and how can it...
  8. H

    ADS square root of matrix

    It is not easy import the data from ads to matlab,when the data is complex.
  9. H

    ADS square root of matrix

    For example, How to know B in equation: A=B*B, (both A and B are matrixs.) Thank you very much!
  10. H

    Is transient small signal or large signal simulation?

    Is transient small signal or large signal simulation?thank you very much~
  11. H

    Vco oscillate at trans but pss not

    Yes ，of course
  12. H

    Vco oscillate at trans but pss not

    cross couple VCO , when simulate using trans ,it oscillte when pss ,it not ,why?? thank you !
  13. H

    ADS substrate definition (metal Pass through different oxide layers)

    Help ~~~~~~~~~
  14. H

    ADS substrate definition (metal Pass through different oxide layers)

    any one face the problem like this？ - - - Updated - - - I found that using the via to connect two metal cost lots of time ...
  15. H

    ADS substrate definition (metal Pass through different oxide layers)

    it is my mistake that the metal layer thickness is error(to thin).
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