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Recent content by Akshe

  1. A

    Plotting a digital bus against an analog signal

    Hi, Is there a way to plot a digital bus signal against an analog voltage signal (on x-axis) as for an ADC? I am using wavescan in cadence IC5.1.41
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    how to let HSPICE plot all the terminal currents of a MOSFET if

    Re: a stupid question: how to let HSPICE plot all the terminal currents of a MOSFET i I am trying to do something similar in cadence using Hspice as the simulator. In my case the mosfet itself is defined as a subcircuit i.e instead of having a mosfet defined as MPM1 in netlist it is defined as...
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    Cadence IC5.1.41 libInit.il

    Adding the following to .cdsinit makes it possible to add user defined model files for ADE at startup: ddGetObj("yourTechLibName") load("myLocalModel.il") I did not load my local libInit file as i was doing it to just change the customExit version of same and my basic aim was to load some...
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    Cadence IC5.1.41 libInit.il

    Hi erikl, I tried to load the local copy of libInit.il and then load the model.il by putting these statements in .cdsinit in my local area. It works that way. But there are some issues that i see. 1. The local libInit.il starts loading but then after the first line itself it starts loading...
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    Cadence IC5.1.41 libInit.il

    Hi, I wanted to know is it possible to overwrite the libInit.il file, which is specified in the project area by a local version of the same?? I am actually trying to load a user defined set of "modelPath"s for the analog design environment. So i have another skill script in my local area to do...
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    importing cadence data in matlab

    Hi, I get the similar error when i try to use the following script - selectResult('tran) outF=outfile("./data.csv" "a") fprintf(outF "%f \t %f", VT("/AP<7>") VT("/AP<6>")) close(outF) Can somebody please help me correct this..
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    Excluding/including specific devices for monte carlo in cadence 6.1.4

    Hi All, I am trying to do monte carlo simulation on a particular block using cadence 6.1.4. I intend to exclude/include some specific devices only for the simulation and have been trying to use the "specify instances/devices" feature in the monte carlo form.. But i am unable to select any...
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    subthreshold bandgap refernece design

    Could you please elaborate a little about the gm/Id method? Ya have not included the startup as of now, was trying to get the core working first ..
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    subthreshold bandgap refernece design

    Re: subthreshold bandgap reference design I did try using the OTA in the design but couldn't achieve a significant difference in results actually. Also for the operating points of the MR1 transistor i had used the region option while displaying the DC operating points and it showed the region...
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    subthreshold bandgap refernece design

    Subthreshold bandgap reference design Hi All, I am new to design and have been working on designing a low power bandgap reference circuit using subthreshold transistors for my college project. The design is based on a reference paper and i am trying to implement it on a different technology...
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    Model parameters for devices in cadence 614

    Hi, I am trying to get an idea as to what a model parameter (that is printed for a device) represents. Can anyone please suggest where i can get the list for it. I am specifically looking for the parameters like mobility, Cox, subthreshold factor, TC of threshold voltage, Vth0 of the device etc
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    Basic doubts about MOSFETS

    I am actually trying to design a bandgap reference and the currents in that case are in nA. The circuit uses subthreshold MOS but needs current mirrors to mirror the current in branches. For that case i would need to have the PMOS and NMOS in saturation right ? I did achieve that with some size...
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    Basic doubts about MOSFETS

    @prestonee : For the MOS as switch i too had the same doubt that with the device being in linear we can attain Vds = 0, rather than for device in saturation which would have a Vth drop. Also I recently read in a doc that mentioned that the MOS is used in cut-off and linear region when used as a...
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    Basic doubts about MOSFETS

    Hi, I have a few general questions about MOSFETs. 1. How exactly do we define the resistance of a MOSFET ? Vds/Ids ? 2. How does the resistance of a MOSFET vary across the three regions(subthreshold,Linear and Sat) of operations ? Also in many places i found that we talk about the...
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    Sizing of devices in bandgap voltage reference

    Hi All, I am trying to size the devices in a bandgap voltage reference circuit. Can anybody please help me understand how should i go about it? What should be my approach? Also i am unable to understand the affect of change of W/L ratio on MOS parameters, as in what all parameters change? Does...
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