Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Recent content by analog_chip

  1. A

    AC sim convergence issue

    Hi, I am simulating a long chain of 40 delay cells. Each cell consists of one all pass delay cells and a buffer. There is a coupling cap between buffer and delay cell. Each unit cell has unity gain. After 30 stages the ac gain shows rough peaks showing convergence issue. I see a zig-zag curve...
  2. A

    Calibre pex extraction: avoid RF model extraction

    Hi, I am using clibre for pex. I want to avoid double extraction of rf models e.g. nfet_rf I have declared xcell file as follows: nfet_rf* nfet_rf The problem is when I use Outputs>Get net names from schematic, this does not work and double extraction happens. When I use get names from...
  3. A

    Significance of S21 plot in Smith chart

    Hi, What is the significance of plotting S21 in Smith chart? I know that it plots normalized (S21-Z0)/(S21+Z0), what is its significance? Plotting S11 makes sense because in that case it represents reflection co-efficient and hence it is helpful in matching etc. But why S21?
  4. A

    Spectrum analyzer in FFT mode vs sept mode

    Hi vfone, Thank you very much.
  5. A

    Spectrum analyzer in FFT mode vs sept mode

    Hi, I know that spectrum analyzer in FFT mode is very fast and can capture short transient events like noise. But in FFT mode sensitivity is hurt. I want to know if FFT mode is better than swept mode in phase noise measurements?
  6. A

    Noise correlation simulation in pnoise

    Hi, 1. I am using IC6.1.6-64b.500.1 and my simulator version is 10.1.1.296.isr18 64 bit 2. I am simulating a basic downconversion mixer as shown in attached figure. I want to know the correlation between noise at RF (red) and noise at IF (blue). I tried to follow the following article...
  7. A

    Coupling co-efficient v/s voltage or current ratio

    Hi Fvm, I have an inductor model from a CMOS process foundry (runs in spectreRF). I want to represent the inductor using lumped components as shown in figure. How can I extract the equivalent values? What do you mean by example of model representation? I dd not understand.
  8. A

    Coupling co-efficient v/s voltage or current ratio

    Hi FvM, Thank you very much! 1. Can you suggest me a simulation technique/paper for finding k i.e coupling factor from a kit inductor model provided by the foundry ? 2. Also I have attached a model of a balun from IEEE paper. Is it possible in momentum to extract the values of lumped...
  9. A

    Plotting gm and its harmonics of transconductance mixer

    Hi, What is the cleanest method of plotting gm and its harmonics in a transconductance mixer?
  10. A

    Noise transfer function

    Hi, I have attached BSIM equivalent model of MOS. I want to know the (transresistance) transfer function from drain channel noise source to the internal vgs of the MOSFET (Not between external G and S but internal vgs excluding Rg and Rs drop) in a particular circuit. I know how to use...
  11. A

    Coupling co-efficient v/s voltage or current ratio

    Hi johnjoe, I know that its for an ideal transformer. My question is how do you express analytically for non ideal case?
  12. A

    Coupling co-efficient v/s voltage or current ratio

    Let us consider two inductors L1 and L2 and let M12 be the mutual inductance with turn ratio 1. Literature says V1/V2=I2/I1=1=turn ratio This is not intuitive to me. If the coils are slightly displaced so that coupling is weak then how V1=V2? It should be less..right? I understand that...
  13. A

    BSIM4 AC noise equivalent MOSFET model

    Hi Dominik, Thank you very much! Do you know how to plot (transient/AC) the vgs of MOS excluding the drop in drain and source resistance (rsw and rdw)? In BSIM4 holistic noise model, a portion is modeled as voltage source at the source side? I want to know how much is that? In the transistor...
  14. A

    BSIM4 AC noise equivalent MOSFET model

    Hi, I want to know BSIM4 noise model of a MOSFET in terms of a simple schematic as attached. I tried looking into BSIM4 documentation but all it has is lots of equation and parameters. I want to know where each noise source is positioned along with parasitics as shown in attached figure.
  15. A

    Induced current in center tapped symmetric differential inductor

    Hi SunnySkyguy, Can you provide some references or links that can educate me in these?
See more

Part and Inventory Search

Back
Top