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Recent content by sbhalerao

  1. S

    How to plot C-V curve in SPICE?

    Re: Plotting CV in SPICE Ok. But I am doing AC analysis. I was wondering how can I sweep the parameter "dd" in the AC analysis?
  2. S

    How to plot C-V curve in SPICE?

    Re: Plotting CV in SPICE Hey, Thanks for the reply. I wrote the following code for the power supply to the gate: Vgs N1 N2 dc 3 ac 1 (N1 and N2 are the nodes) .. So now I have to change 3 V to find C-V at different Vgs. Is there any way that I could sweep that Dc voltage in the above code?
  3. S

    How to plot C-V curve in SPICE?

    Hi, I am using Aim SPICE (which is based on SPICE3) and I want to plot C-V curve for a MOSFET. Some of the models that I am looking for are available only in Aim SPICE and so I have to use it. There must be a generic solution for any SPICE program (based on SPICE3). Could anyone suggests some...
  4. S

    Help !! Body effect in NMOS

    body effect nmos Hi to all, I am currently working on a circuit design that requires me to consider the body effect in NMOS.. could anyone clarify what this effect is exactly?? Also, what steps can be taken to avoid this effect ?? I want to tackle body effect as it is reducing the output...
  5. S

    Simualtion and design of circuits using GaAs HEMTs/ MESFETs

    Hi to all, I want to design and simulate a circuit using HEMTs (GaAs) instead of normal CMOS.. I have made a detailed analysis and have to the conclusion that GaAs would be a better option for a circuit that I am presently designing.. I have simulated the present CMOs...
  6. S

    Need help with building microstrip antenna

    Re: Microstrip antenna I designed a folded patch antenna.... Its about (lambda)/16 sized antenna... I did NOT get any method to increase the antenna impedane... So the output voltage was not that high... As a result, I used a array of such antennas.. I used Ie3D to simulate the folded...
  7. S

    Help!! What is the max value of "on chip" capacito

    Hi to all, I am currently working on a research problem.. I am stuck at a point where we need to decide whether our system can be fabricated on a chip... Our system needs 1uF (16 nos.) capacitors, a 10 uF capacitor and a 5.5 uF capacitor ....... Can such values of...
  8. S

    PSpice Error -- help needed

    pspice error I guess this is a error due to something that I am ignoring while I simulate... The error is -- ERROR -- Expecting keyword STIMULUS, saw SIGNAL. Why do you think I got this error???
  9. S

    Help- Design of charge pump using low Vt NMOS

    zero vt charge pump I just wanted to get this verified from all people here --- For zero- Vt NMOS , I just need to put Vto= 0 in the SPICE model ?? I am not using any biasing and Vto = Threshold voltage at zero bias ...
  10. S

    The difference between one-hot encoding and binery encoding

    Re: state machine State machine design will be described in any Digital design or Switching theory book.. Refer to Zvi Kohavi - "Switching Thoery and Finite Automaton".. I also think that state machine design is described in M.Morris Mano.
  11. S

    What is the advantage of manchester coding in encoding audio data?

    Re: manchester coding There is a transition in every bit duration .. The transition density is high which makes the clock extraction using PLL easier. In other baseband encoding methods (eg- RZ unipolar) there is a DC value - this poses sgnificant problems in RF communication systems (like...
  12. S

    Help- Design of charge pump using low Vt NMOS

    zero vt nmos So you mean that I should just put Vto = 0 V in the BSIM model to be used in SPICE ?? I also was thinking on similar lines, but I did not know if changing this parameter in the BSIM model is the correct thing to do.. I am using BSIM 3.3 model for NMOS 0.18 um technology.. Thanks...
  13. S

    Help- Design of charge pump using low Vt NMOS

    spice charge pump Thank you slchen for your reply. The voltage swing of the clock signal is 0.5 V... I actually did not anticipate any problem regarding large reverse leakage current... And how do I use a zero - Vt NMOS ??? How is the zero Vt possible?? What model/parameters do I use in SPICE...
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    Help- Design of charge pump using low Vt NMOS

    low vt high vt Hi to all, I am presently a part of research group. We are analysying various circuits to be used in a Wireless Sensor node.. We need to design a charge pump (Dickson Charge pump) that takes a input of ~0.2 V or ~ 0.3 V and converts into `2 V at the output.. We are...
  15. S

    Help!!! Low Vt NMOS in TSpice

    Hi to all, I presently working on a research problem on wireless sensor Networks... I need to design a Dickson charge pump.. I plan to simulate it using TSpice.. However, I am facing certain problems due to lack of familiarity with the TSpice as well as the fact that I don't have that...
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