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Recent content by cl254

  1. C

    Hspice mos capacitance output & parameters in mosfet output templates

    Dear All, If we do a .OP in HSPICE, for a transistor we can see at the end of the list there are cdtot/cgtot/cstot/cbtot/cgs/cgd. For the transconductance gm, it can be easily called by LX7 (GMO, DC gate transconductance). How about the corresponding MOS parameters for each of...
  2. C

    Need Low Freq. CGD from CDGBO, CGDBO, or simulation

    Dear All, I use HSPICE and in its MOSFET Output Templates, there are parameters with names reversed like CDGBO (LX32, intrinsic drain-to-gate capacitance, =-dQd/dVg) and CGDBO (LX19, intrinsic gate-to-drain capacitance, =-dQg/dVd), looks like they are transcapacitances. My circuit is not high...
  3. C

    Unity gain frequency of a two stage amplifier

    Hi All, In a two-stage amp with capacitive feedback, the closed loop circuit 3dB frequency (closed loop bandwidth) is equal to cut-off (crossover) frequency of the loop gain (T(s)) --> w(-3dB)_CL = wc_T What is the cut-off frequency of the closed loop circuit (wc_CL)? Somehow the wc_CL equals...
  4. C

    Need a Free/Paid Schematic Capture Tool (Details Specified) for HSPICE

    Dear All, I know this topic has been raised many times ('Schematic tool to get netlist for HSPICE' by deardeepa76, 'Hspice Schematic viewer' by cwcwecan, and 'HSPICE netlist from Schmatic editor' by fireball003); but none of them contains the details I am looking for. Let me address my question...
  5. C

    NEED RESOURCES FOR UNDERSTANDING DRAM TIMING: tWRR, tWRDR, tWWDD, tRRDR...

    Hi All, Please explains or point me to some good resources on advanced DRAM timing settings from BIOS. Verbal explanations for some of these timing parameters could be found on the web (see the end), I am looking for clearer details, and their relationships with tRAS, tCAS and other standard...
  6. C

    Error: "Some of the faces were not uncovered to avoid creation of mixed body."

    Error: "Some of the faces were not uncovered to avoid creation of mixed body." When I run a TL simulation in HFSS, I get this error: Some of the faces were not uncovered to avoid creation of mixed body. Picture attached. Anyone? Thank you!
  7. C

    How to create touchstone file?

    Thank you for the quick reply, Volker. But Data File Tool outputs all s-param together at the same time, since the simulation has multiple terminals and each terminal gives one .s1p file, while I only want one of the .s1p file in the dataset. Even if I manually create a file with header, how do...
  8. C

    How to create touchstone file?

    Hi All, From ADS's .dds file, using table format, I have output a column of frequency, a column of magnitude, and a column of angle, and I have used Excel to separate them and saved as .txt file. Please let me know how to create .s1p file from this data so I can use WinCal's "Measure" to...
  9. C

    Change model Level=11 (Cadence) to Level=49 (Hspice)

    Thank you very much falcon, I will pay attention to that next time I transfer the model. cl254
  10. C

    HFSS, model RC lumped elements using LumpRLC

    Hi all, I have one structure built up in HFSS and I want to put in series a R and a C to it. Do I just create one LumpRLC port to model the C and another LumpRLC port to model the R and connect them in series (flat, not vertical) and connect them to the end of my structure in series? It is...
  11. C

    Calculate Miller Capacitance from Model Parameters in Cadence

    Dear all, How to calculate miller capacitance from the model parameters of a transistor that's biased up? Another related question is that when I want to use simple equation to find a particular parameter, say use Cgs as part of ft expression, how to find this capacitance? Since there are Cgs...
  12. C

    Q: Using "Connectivity" in Cadence

    Hi Everyone, I have a layout that has lots of cells put together. Between the cells they are connected through metals. For example, cell 1's metal2 is connected with cell2's metal2, and cell2 is connected with cell3 through metal7; within cell2 metal2 is connected to metal7. How do I ask...
  13. C

    Need: View/Change Design Variables in an easier way

    Hi Everyone, I have a design that has many variables, about 50, and I wonder besides using the "Editing Design Variables" window in Analog Design Environment, is there another way to view/change the variables so I do not need to scroll the tiny variable window up/down frequently? Another...
  14. C

    Interpreting In/out referred noise of chopper amplifier

    I think now I can close my own loop. My output is differential, there is a R and a C in parallel between the outputs. I measured between the outputs for noise simulation. With the RC, the output referred noise has 1/f^2 component, and the drop is 20dB/dec instead of 10dB/dec. Without the RC...
  15. C

    Interpreting In/out referred noise of chopper amplifier

    Hi FvM, Thanks for the reminder, actually I left the output of demod with no connection and still see 1/f noise at DC! Now I suspect that Cadence uses another set of output noise other than the one it uses to calculate input referred noise, this is the most reasonable answer, but still does...
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