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Recent content by krivan

  1. K

    noise analysis in cadence

    cadence noise analysis Hi, I want to perform noise analysis in cadence [AMS 0.35um] but I haven't found any really relevant tutorial in the topic. Could someone please send me a tutorial, or a link to such a document? I have already checked cadence sourcelink as well but it haven't returned...
  2. K

    noise analysis cadence[AMS 0.35um] - request for resources

    noise analysis cadence Hi, I want to perform noise analysis in cadence [AMS 0.35um] but I haven't found any really relevant tutorial in the topic. Could someone please send me a tutorial, or a link to such a document? I have already checked cadence sourcelink as well but it haven't returned...
  3. K

    suggestion for I/O pads AMS 0.35um

    io 0.35um Hi, I need a suggestion regarding I/O pads for my chip. I want to put down pads which are guarded against ESD/have diode protection at the input, etc. The problem is that there are so many pads in the library that I don't have a lcue which would be the best bet. The data sheets of...
  4. K

    voltage level shifter design

    Yepp, it is also a good idea. I've already implemented it but I need a circuit from just a couple of transistors which dont occupy a lot of space, like voltage-follower amp.+resistor...
  5. K

    voltage level shifter design

    Hi, I need a cmos voltage level shifter circuit which shifts *exactly* 400 mV on a DC analog signal. I thought about voltage adder/substractor circuit but they are not applicable because of the resistors. Does anybody have an idea how to shift exactly 400 mV on-chip? Thx, Krivan
  6. K

    Recommend me a software for drawing circuit diagrams

    latex circuit diagram P-Spice, Tina-Pro, Orcad, Cadence Opus/Mentor schematic editors + Ctrl-PrintScreen + Paste into Microsoft Paint? Krivan Added after 1 minutes: ah, for documentation purpose. Draw the schematic in any of the softwares suggested above and you sure can export it into...
  7. K

    need help in designing 10Mhz CMOS Oscillator

    Hitotsu, in this case I would use a simple ring oscillator as it has already been suggested. Put down odd number of inverters and with the variation of their vdd voltage the output frequency will change as well. This vdd is obviously not vdd!, which is the common positive rail. So: odd number...
  8. K

    switched capacitor filter

    capacitor filter Hi, I do chopper-stabilization in my circuit and I want to low-pass filter the output signal. I want to set the corner frequency of the filter to 100 Hz. In a normal first-order LPF it would mean 320 MOhm && 5 pF. I implement the resistor as a simulated [switched-cap] resistor...
  9. K

    config file for IC5141???

    Hi, I'd like to make some parameters [like undo limit -> 10] set automatically when I start the IC5141 Cadence version. I haven't found any appropriate config file where I could have changed it. Does somebody know how I can set the parameters in advance, or could somebody please send me a...
  10. K

    rpoly2, or rpolyh- when/why is one better than the other?

    parasitic capacitor rpolyh Yes, I know, thanks, but some says that the usage of rpoly2 is more beneficial because it is more precise. However I don't understand why because the uncertainty of the rpolyh is 20%, so as the rpoly2. So basically the questions is: do I get a resistance around...
  11. K

    rpoly2, or rpolyh- when/why is one better than the other?

    rpoly2 Hi, I have to use a resistor of 20kOhm. In the kit I have rpoly1, rpoly2, rpolyh. The colleagues suggested me to use rpoly2 but the rpolyh semms to be a better solution for me. Does somebody know when/why is one better than the other? Thx, K.
  12. K

    Cadence - Java - libjvm.so trouble

    cadence locking assertion failure Hi, when I start my Cadence environment I get a lot of error messages being related to Java Runtime Environment. msfb : HIT-Kit=3.70 tech=c35b4 Locking assertion failure. Backtrace: #0 /usr/lib/libxcb-xlib.so.0 [0xaae1a767] #1...
  13. K

    CADENCE ENCOUNTER TUTORIAL

    cadence encounter Hi, at first I want to thank you as well that you made public your work. I didn't go in details because lack of time so just which I noticed[I assume this has been made for students]: In the cadence tutorial there is no spacing between text and image at Fig. 1., Fig. 5...
  14. K

    chopper-stabilized amp - voltage levels fall, need help

    chopper-stabilized amp Hi, I am trying to design a chopper-stabilized amplifier, seen below. The input signal is a 1Hz [1V DC+100mV amplitude] sine wave and the chopping frequency is 10 kHz. So I modulate the signal with the first switching block, then it gets amplified and demodulated. Well...
  15. K

    about current steering DAC

    current steering dac output I would say that is because after the different current sources [mirrors] you have a high-impedance point -> buffering/opamp needed, and you produce a current but you may convert it to a voltage at the output, so the configuration of the opamp with the resistors...

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