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Recent content by GusTheCat

  1. GusTheCat

    need help in wide band opamp design

    Well, the 110 dB gain, if at dc, is no problem. However, the 1 nF cap load will always make your ampflifier act as an integrator. If your target is high gain at high frequency, you have to use some inductors, and that will make it narrow-band. If your target is high Gain-bandwidth product, then...
  2. GusTheCat

    What's the difference between an analog and digital pad?

    Re: layout of pad frame Yes, what's the question?
  3. GusTheCat

    Simulating a Bandgap in Cadence

    Here is a Spectre model file including BJT models: **broken link removed**
  4. GusTheCat

    How to do noise simulation for switched Cap Filter?

    Read the spectre reference manual. If you have Cadence, then your institution/company has the documentation on UNIX servers, and the docs should be public to all unix users.
  5. GusTheCat

    how to calculate the output impedance of a circuit?

    My two cents' worth: you want to "zero" all inputs. If a voltage input, make it AC Ground, with proper dc biasing; if a current input, leave it open. Sometimes I found that a ac CURRENT source is more convient at the output. You measure the votlage that way.
  6. GusTheCat

    How to use Spice to plot the DC transfer characteristic ?

    Re: pspice I would do .tf analysis for dc transfer characteristics. It will even give you Zin and Zout. Look at the index for tf.
  7. GusTheCat

    Channel Length Modulation (lambda): SPICE Problem

    channel length modulation hspice parameter Well, I may be foolhardy... or brutal, as they call it. I will go ahead and grab screen shot, store it as bmp or jpeg, then use Matlab to read it in, then search for the location where the color is the plot, then I get coordinate information. Once I...
  8. GusTheCat

    Looking for good manuals to learn Matlab quickly

    Re: matlab I suggest launch Matlab directly, and learn by trying. For example, type in, 1+2, then A = 1; B = 2; A + B, and the like. The good thing is that Matlab has an excellent help system for any functionalities you do not know, and once again, anything in doubt, try it out.

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