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 yschuang

  1. Y

    Layout of Power devices

    Hello, timof I can not find any information on good layout styles and typical mistakes like you said in the link and was wondering if you can post the link more specificially. Thanks
  2. Y

    A study of the contacts of a diffused resistor

    Hello, all I was wondering if anyone happens to have this paper. "A study of the contacts of a diffused resistor" by Chung-Yu Tinga and Charles Y. Chena ScienceDirect - Solid-State Electronics : A study of the contacts of a diffused resistor Thanks a lot.
  3. Y

    Some questions on a application note.

    Hello, all I am reading an application note called "Modeling, Analysis and Compensation of the Current-Mode Converter" and find some equations that I can not derive. Here are equations I can not derive. Equation(5), (6), (11), and ( 18 ) Wish someone can help me out. Thanks in advance.
  4. Y

    How to reduce the time for overload recovery !!

    Hello all I am designing a ckt and the output node will be shorted to ground. Therefore, the voltage at gate node should be clamped for the over-current protection. At first, the over current will be limited around 1.2A. After the first over current protection, the output current should be...
  5. Y

    A question on Class AB opamp

    Vgs of M28 and M20 will be the same if the currents through M28 and M20 and size of M28 and M20 are the same. Currents through M28 and M20 are the same. The size of M28 is larger than that of M20. The Vgs of M28 is definitely smaller than that M20. I = 0.5uCox(W/L)Vgst2 Anyway, thanks for your...
  6. Y

    A question on Class AB opamp

    **broken link removed**Hello, all I have a question on the size of some transistos and marked them in red. The question is why they are not equal and why they are sized like that way(50/2, 24/2). What I thought is try to set sources of M20 and M28 equal but that is not true. Thanks a lot.
  7. Y

    Want to know the current in the subcirt.

    Hello, I would like to know the current through a resistor, which is a subcircuit. XRX N22 N23 RNP R=3740.69 L=9.6U W=2.4U M=4 I use the following statement to probe the current but that does not work. .probe i_rx = par('i1(XRX)') The error message is the following **error** check output...
  8. Y

    Transistor Properties in Layout simulation

    I think I go with rfsystem. The following commands are copied from the website of Mentor and it is probably helpful. DEVICE mn gate gate sd sd [ PROPERTY W L AS AD PS PD ...//others ... //other calculations such as W and L... AS = area(S) AD = area(D) PS = perimeter(S) PD = perimeter(D) if ( AS...
  9. Y

    Transistor Properties in Layout simulation

    I am with erikl about the perimeter which does not count the gate edge. The discrepancy betwen perimeter=(w + 2*(area length)) and the real parameters extracted by LVS commands is probably because it is a dog bone. You have to see the real layout and know how to calculate the perimeter. The...
  10. Y

    Noise simulation on a flip-around SHA

    Hello, all I have a question about how to do the noise simulation of a "flip-around" SHA in the hold phase. To be more precisely, I question the total output noise @ the hold phase because the magnitude of noise is much larger than expected. If I hook up the circuit like a charge transferred...
  11. Y

    Question on the loop gain/phase

    Hellow, Lvw Thanks for your kindly file and I will try to do that way and find out what's going wrong. FvM, I know that syntax to show the phase.
  12. Y

    Question on the loop gain/phase

    Hello, LvW Assume Tv = -Vr/Vt, Ti = Ir/It. Vt and It are input ac voltage and current singals. Vr and Ir are returned ac voltage and current signals. For now, skip the formula the loop gain. Like you said, the voltage/current loop gain is the ratio of returned signals. In a waveform viewer, the...
  13. Y

    Question on the loop gain/phase

    Hello, Lvw. I go with you but the consequence seems to be dissapointed. I can do 2 ac runs in one simulation and get information about magnitude and phase on nodes I want. However, I will lose information about phase if I try to multiply two nodes and all I get is the magnitude. By the way, Tv...
  14. Y

    Question on the loop gain/phase

    Hello, sutapanaki. It's true that the formula in the 1st post is derived from Middlebrook's method. You are right again about how to break the loop magically and perserve dc bias when simulating the loop gain. Actually, I am using a method like the link...
  15. Y

    Question on the loop gain/phase

    Hello, sutapanaki . I am not using Middlebrook's way to do the simulation and get the loop gain but kind of using LC method from "Determination of stability using return ratios in balanced fullydifferential feedback circuits" and get the return ratio. Please see fig.3 for the LC method and...
See more

Part and Inventory Search

Back
Top