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Recent content by asgg

  1. A

    Which region of pass element(LDO) should be?

    I'm using .18 process, and as you say the PMOS is in cutoff region not in linear region. thanks!
  2. A

    How to use Awaves Expression Builder,plz

    awaves expression builder hi DZC, this operation is very simple. fist select v(a), then press middle key of your mouse(or press left and right key simultaneous) and drag it to expression window. sencond, click "-" in the oprators. third, use the same opration like the first drag v(b) to the...
  3. A

    Which region of pass element(LDO) should be?

    yeah,:D, you are right! It cutoffs! And when 1uA,the voltage of node A is very high(2.9V). So how to tackle this problem?
  4. A

    Which region of pass element(LDO) should be?

    thank you all! But on the contrary, my simulations show PMOS pass transistor(M6) get into linear or cut off region when load current is very small (1uA) and saturation when load current is very large(100mA). The vin is 3.3V and vout is 1.8V. the vin is constant, so the vds of PMOS is constant...
  5. A

    Which region of pass element(LDO) should be?

    Hi, I'm designing a LDO circuit. In order to aquire a large output current(100mA), I make the W/L of pass element PMOS 6000/1. But when RL is large, i.e. the output current is very small (such as 1uA), the pass element PMOS cuts off or works in linear region. So, which region of pass element...
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    Help: Question about the rail to rail op amp

    Hi,Alles Gute Thank you very much! Would I can get the gm_total from the equation below? gm_total=(Io1-Io2)/(Vin+ - Vin-)
  7. A

    Help: Question about the rail to rail op amp

    Thanks! In rail to rail fig, I know the gmn is of M5, and gmp is of M6. But in the gm.jpg you post , the gmtotal is not the curve by simulation! My question is with the maximum current select circiut how to simulate the total gm?
  8. A

    Help: Question about the rail to rail op amp

    I'm designing a rail to rail amplifier. As anybody knows, the input total transconductance(gm) must be constant. There are several methods to accomplish it. Such as using 1:3 current mirror, level shift, tail current control, voltage control. I use maximum current select circuit to achieve a...
  9. A

    The question about the spice model...

    I have a TSMC spice model. But it is for ADS. I do simulation by hspice on my personal computer. So there's some problems I cannt resolve. At first I use '.lib' to find the spice model. But it cannt find the 'TT' or 'FF'. So I use '.inc' . But many errors come out. The errors is ; translated...
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