Hi, Please help. Where can I find the pass transistor's working curve under 1.2V that is widely used in IC design preferebly in any articles, instead of in books? Thank you. Weng
Where can I find the pass transistor's working curve under 1.2V?
Started by ●May 1, 2007
Reply by ●May 1, 20072007-05-01
Weng, If you need spice models for devices, contact your local semiconductor fabrication house (Chartered, UMC, TSMC, etc..) and request the models for the technology node you are interested in. Choices are typically: low power, or high performance (high Vt, low Vt); 130nm, 90nm (the min gate length), and so on. Generally speaking, these models (which are used by IC designers) are kept under very strict non-disclosure for new technology nodes. Depending on how advanced the models are, BSIM 4, or BSIM 4.5 spice models are the "best" right now, and many are good to use in RF analog circuits, and have proximity effects, NBTI, and other real world behaviors modeled, too. Austin Weng Tianxiang wrote:> Hi, > Please help. > > Where can I find the pass transistor's working curve under 1.2V that > is widely used in IC design preferebly in any articles, instead of in > books? > > Thank you. > > Weng >
Reply by ●May 1, 20072007-05-01
On May 1, 11:16 am, austin <aus...@xilinx.com> wrote:> Weng, > > If you need spice models for devices, contact your local semiconductor > fabrication house (Chartered, UMC, TSMC, etc..) and request the models > for the technology node you are interested in. > > Choices are typically: low power, or high performance (high Vt, low Vt); > 130nm, 90nm (the min gate length), and so on. > > Generally speaking, these models (which are used by IC designers) are > kept under very strict non-disclosure for new technology nodes. > > Depending on how advanced the models are, BSIM 4, or BSIM 4.5 spice > models are the "best" right now, and many are good to use in RF analog > circuits, and have proximity effects, NBTI, and other real world > behaviors modeled, too. > > Austin > > > > Weng Tianxiang wrote: > > Hi, > > Please help. > > > Where can I find the pass transistor's working curve under 1.2V that > > is widely used in IC design preferebly in any articles, instead of in > > books? > > > Thank you. > > > Weng- Hide quoted text - > > - Show quoted text -Hi Austin, Actually what I need is not a precise latest pass transistor working curve. I thought it were available somewhere such that I has requested the latest version. What I really need is a typical V-I or V-V working curve of any typical pass transistor to learn some basic, not sophisticated characteristics. I think it should be availble somewhere and not a commercial secret. Because I think pass transistors are one of the most basic elements in IC industry and it should be included in any IC textbooks. I don't know which textbook contains the latest information about it. Thank you. Weng
Reply by ●May 1, 20072007-05-01
Weng, Any mosfet model should be adequate for what you need. There is no difference between a "pass transistor" model, and any other kind of spice mosfet model. Austin
Reply by ●May 1, 20072007-05-01
On May 1, 6:32 pm, austin <aus...@xilinx.com> wrote:> Weng, > > Any mosfet model should be adequate for what you need. > > There is no difference between a "pass transistor" model, and any other > kind of spice mosfet model. > > AustinHi Austin, Do you have any idea where I can get a graph of it? I just want the graph showing the relationship between input and output. Thank you. Weng
Reply by ●May 2, 20072007-05-02
On 1 May 2007 18:50:32 -0700, Weng Tianxiang <wtxwtx@gmail.com> wrote:>Do you have any idea where I can get a graph of it? I just want the >graph showing the relationship between input and output.Why not simulate one in any of the free versions of SPICE? -- Jonathan Bromley, Consultant DOULOS - Developing Design Know-how VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK jonathan.bromley@MYCOMPANY.com http://www.MYCOMPANY.com The contents of this message may contain personal views which are not the views of Doulos Ltd., unless specifically stated.
Reply by ●May 2, 20072007-05-02
On May 2, 12:41 am, Jonathan Bromley <jonathan.brom...@MYCOMPANY.com> wrote:> On 1 May 2007 18:50:32 -0700, > > Weng Tianxiang <wtx...@gmail.com> wrote: > >Do you have any idea where I can get a graph of it? I just want the > >graph showing the relationship between input and output. > > Why not simulate one in any of the free versions of SPICE? > -- > Jonathan Bromley, Consultant > > DOULOS - Developing Design Know-how > VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services > > Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK > jonathan.brom...@MYCOMPANY.comhttp://www.MYCOMPANY.com > > The contents of this message may contain personal views which > are not the views of Doulos Ltd., unless specifically stated.Hi Jonathan, What I need is a graph of pass transistor's working curving that must be available in some books or articles. I have no Spice experiences and even don't know what proper parameters should be. Weng
Reply by ●May 2, 20072007-05-02
On 2 May 2007 03:54:52 -0700, Weng Tianxiang <wtxwtx@gmail.com> wrote:>What I need is a graph of pass transistor's working curving that must >be available in some books or articles.Weng, sorry, it's been a while since I looked in detail at this kind of stuff. There is some nice information on the use of pass switches for digital applications in the technical notes for QuickSwitch devices: http://www.idt.com/products/files/7591/quickswitch_basics.pdf http://www.idt.com/products/files/7528/TN_07.pdf I'm sure this is not everything you need, but perhaps it will put you on the right track. Of course, the exact behaviour will depend strongly on the details of the pass transistor itself - gate threshold, etc. Note that QuickSwitch devices use single NMOS pass transistors. For basic information on CMOS pass structures, try http://www.fairchildsemi.com/ds/CD/CD4066BC.pdf although that part is fairly ancient history now.> I have no Spice experiences > and even don't know what proper parameters should be.If you are concerned about the detailed analog behaviour of pass transistors, I suggest you *should* get some SPICE experience, double-quick! hth -- Jonathan Bromley, Consultant DOULOS - Developing Design Know-how VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK jonathan.bromley@MYCOMPANY.com http://www.MYCOMPANY.com The contents of this message may contain personal views which are not the views of Doulos Ltd., unless specifically stated.
Reply by ●May 2, 20072007-05-02
Weng, 1. Learn spice 2. Use spice. Austin Weng Tianxiang wrote:> On May 2, 12:41 am, Jonathan Bromley <jonathan.brom...@MYCOMPANY.com> > wrote: >> On 1 May 2007 18:50:32 -0700, >> >> Weng Tianxiang <wtx...@gmail.com> wrote: >>> Do you have any idea where I can get a graph of it? I just want the >>> graph showing the relationship between input and output. >> Why not simulate one in any of the free versions of SPICE? >> -- >> Jonathan Bromley, Consultant >> >> DOULOS - Developing Design Know-how >> VHDL * Verilog * SystemC * e * Perl * Tcl/Tk * Project Services >> >> Doulos Ltd., 22 Market Place, Ringwood, BH24 1AW, UK >> jonathan.brom...@MYCOMPANY.comhttp://www.MYCOMPANY.com >> >> The contents of this message may contain personal views which >> are not the views of Doulos Ltd., unless specifically stated. > > Hi Jonathan, > What I need is a graph of pass transistor's working curving that must > be available in some books or articles. I have no Spice experiences > and even don't know what proper parameters should be. > > Weng >
Reply by ●May 9, 20072007-05-09
