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Recent content by tanghua_0407

  1. T

    the problem of well isolation

    enhancement moscap hi ,all ,in layout,the C always be isolated with the Psub by nwell. I find that the N well can be connected to vss vdd or no voltage at different occasion ,what is the difference of different connection,thx.
  2. T

    switched capacitor circuit simulation

    hi,all ,can someone tell me how to use pss to simulate the switched capacitor circuit ,and then use the pnoise to get the output noise.thanks
  3. T

    question about the calibre

    I just means the calibre of new edition can't finish the excluding or including whole cell .
  4. T

    question about the calibre

    Hi,everyone ,you know ,we can use the calibre to extract the parasitic parametre ,for example CC ,RCC etc.For the old edition calibre ,wo can use the XI20/? (just for example) to excluding the whole cell,but the edition can't recognise the "?" ,so XI20/? is useless for new edition. So ,help...
  5. T

    a question about Cgs and Csg in the circuit

    when i do the simulation with the circuit ,the Cgs and Csg of the transistor are not equal ,why??
  6. T

    a simple resistor noise anlysis

    Can i stimulate the noise with Hspice??
  7. T

    Beginner - Layout techniques

    hi,I think that in spite of the tools you will use ,first you must master the process of the circuit ,such bipolar ,cmos ,bicmos and so on! then you must know that the design regulation refers to the electrolic parameter.So don't refer to the design regular mechanically, but properly! Added...
  8. T

    About bandgap reference design

    If the stablity of the opam must be thought? So the one stage opam is best ,then we needn't to thought the stability@ Added after 2 minutes: If the stability of the opam must be thought ,So the one stage opam is best??
  9. T

    What are the specifications of opamp design for bandgap?

    opamp design for bandgap The offset is very important to the OPA,it badly affect the reference voltage
  10. T

    how to design a low voltage opa without special transisitor?

    it is used in a bandgap reference ,input common mode is about 0.6v,the vdd is from 0.8 to 4v !there are some data about the opa ,but they don't explain how to design the bias circuit ! i feel difficult to design the bias for so large range vdd!
  11. T

    how to design a low voltage opa without special transisitor?

    hello everyone,I need a opa ,it's voltage is 1V,how can i do it?tanghua_0407@163.com thanks!
  12. T

    question about frequency compensation

    hello everyone! I have a question about frequency compensation. In the operation amplifier ,there are two poles : p1=-1/R1C1 p2=-1/R2C2 always ,in the case that p1 is the first pole and p2 is the second pole,we can use miller compensation . but if because of the large C load , p2...
  13. T

    Why are gain & phase margins not reliable tests of stabi

    Gain and Phase Margins i don't what you mean!
  14. T

    how to stimulate a CMOS operational amplifers?

    sorry,what is XF ?I am a beginner !!
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