Hspice input file

Similar threads C. Analog Circuit Design. How to use wire in HSpice? Started by Sadegh. How to read such file in Hspice? Started by ilter Aug 30, Replies: 2. Started by z Dec 12, Replies: 5. Started by prcken May 4, Replies: 0. Part and Inventory Search. Welcome to EDABoard. Click to expand Bro, then what about Mentor Graphic? I using Ac analysis to simulate out Input noise and output noise, but how i simulate input referred noise?

Hughes, A very comprehensive expln. Thanks a lot. I was able to get the noise summary. How do I go about it. Please help. Thanks and regards, Guru. Ruole Newbie level 3. Re: hspice noise :shock: HI I have achieved the waveform of input noise and output noise, however i think there is something wrong about the noise value. Similar threads.

Started by Material Sep 30, Replies: 0. Analog Circuit Design. How to measure input referred noise using spectrum analyzer? Started by TiwstedNeurons Jun 27, Replies: 0. How to measure input referred noise for transimpedance amp.? Started by surianova Sep 17, Replies: 3. Part and Inventory Search. END statement, which computes the description of the entire circuit including any simulation controls.

Any text that follows the. END statement is treated as a comment and has no effect on the simulation. All of the circuit elements are connected by circuit nodes.

Every circuit file must have a reference node, the ground node, and every other node in the circuit file must have a DC path to ground. Along with a ground node, all terminals must be connected to at least one other terminal.

This is a precaution against dangling wires. The circuit file for our example uses only two-terminal devices, a voltage source and two resistors. A seperate line is used to describe each element in the circuit. The basic syntax is. There are no one-terminal devices in Hspice. Devices more than two terminals use basically the same form, but with more optional [node The devices' values are a number that describes the size of the device.

Okay, let's do some examples. Here are three simple RLC circuits, let's see if you have the right format for the input file. This section describes passive elements and they are resistor, inductor, and capacitor.

Assorted magnetic elements are supported by Hspice but they are not included. Using the set of passive elements and models statements available, you can construct a wide range of board and integrated level designs. To use a particular element, an element statement is needed.

It specifies the type of element used. It has fields for the element name, the connecting nodes, a component value and optional parameters. The general form is shown below:. Element parameters within the element statement describes the device type, device terminal connections, associated model reference, element value, DC initialization voltage or current, element temperature, and parasitic. As you might have guessed, we can specify these three passive devices merely by using the first letter of the device name.

Fortunately, most of the resistors, inductors, and capacitors we use on lab-bench are nearly ideal and for our purposes we can consider them to be ideal.

To specify the device in the circuit file, we can include the name of the device, how it is connected into the circuit, and its value. Hspice uses the basic electrical units for voltage volts and current amperes and uses the basic electrical units for device values: ohms, farads, and henries. Here are some example devices:.

To simulate your circuits you will need some way to tell Hspice what is "exciting" or supplying electrical power to the circuit.

We specify these sources in a way similar to the passive devices described earlier: name, connecting nodes, and value.

As you might have expected. A voltage source is like a battery, or lab-bench power supply. Using positive current convention, current flows out from the first node, through the circuit and then into the second node. A current source provides a fixed value of current to the circuit. Column lamination means that the columns of files with the same number of rows are arranged side-by-side. For example, for three files D , E , and F containing the following columns of data,.

The number of columns of data need not be the same in the three files. This listing takes columns from file1 , and file2 , and laminates them into the output file, fileout. Columns one, two, and three of file1 , columns one and two of file2 are designated as the columns to be placed in the output file. There is a limit of 10 files per. Path name of a file for computer operating systems supporting tree structured directories.

Name of a file to include in the data file. The file path plus file name can be up to characters in length and can be any valid file name for the computer's operating system.

The file path and name must be enclosed in single or double quotation marks. Model name reference. Elements must refer to the model by this name. Note: Model names that contain periods. Selects the model type, which must be one of the following:. Parameter name.

The model parameter name assignment list pname1 must be from the list of parameter names for the appropriate model type. Default values are given in each model section. The parameter assignment list can be enclosed in parentheses and each assignment can be separated by either blanks or commas for legibility. Star-Hspice release numbers and the corresponding version numbers are:. Using the parameter with any other model or with a release prior to H93A. Please see Selecting Model Versions for more information.

You can place commonly used commands, device models, subcircuit analysis and statements in library files by using the. LIB call statement. As each. LIB call name is encountered in the main data file, the corresponding entry is read in from the designated library file. The entry is read in until an. ENDL statement is encountered. You also can place a. LIB call statement in an. ALTER block. Path to a file. Used where a computer supports tree-structured directories.

When the LIB file or alias resides in the same directory in which Star-Hspice is run, no directory path need be specified; the netlist runs on any machine. You can use the ".. The combination of filepath plus filename may be up to characters long, structured as any valid filename for the computer's operating system.

File path and name must be enclosed in single or double quotation marks. Entry name for the section of the library file to include. The first character of an entryname cannot be an integer.

You can build libraries by using the. LIB statement in a library file. For each macro in a library, a library definition statement. LIB entryname and an. ENDL statement is used. LIB statement begins the library macro, and the. ENDL statement ends the library macro. ENDL entryname2. LIB entryname3. ENDL entryname3. The text following a library file entry name must consist of valid Star-Hspice statements.

Library calls may call other libraries, provided they are different files. Shown below are an illegal example and a legal example for a library assigned to library "file3.

Library calls are nested to any depth. This capability, along with the. ALTER statement, allows the construction of a sequence of model runs composed of similar components with different model parameters, without duplicating the entire Star-Hspice input file.

A library may contain nested. LIB calls to itself or other libraries. The depth of nested calls is only limited by the constraints of your system configuration. A library cannot contain a call to a library of its own entry name within the same library file. A library cannot contain the. END statement. LIB statements within a file called with an. ALTER processing. The simulator accesses the models and skew parameters through the.

LIB statement and the. The library contains parameters that modify. MODEL statements. The following example of a. LIB of model skew parameters features both worst case and statistical distribution data. The statistical distribution median value is the default for all non-Monte Carlo analysis. This statement allows a library to be accessed automatically. Automatic library selection allows a search order for up to 40 directories.

The hspice. Use this file for any directories that should always be searched. Star-Hspice searches for libraries in the order in which libraries are specified in. When Star Hspice encounters a subcircuit call, the search order is as follows:. Read the input file for a.

MACRO with call name. Read any. INC files or. LIB files for a. MACRO with the call name. By using the Star-Hspice library search and selection features you can, for example, simulate process corner cases, using. Each file contains different Star-Hspice transistor models representing the different process corners. Store these files all named iobuf. Use the. PARAM statement to define parameters.

Parameters in Star-Hspice are names that have associated numeric values. You can use any of the following methods to define parameters:. A simple parameter assignment is a constant real number. The parameter keeps this value unless there is a later definition that changes its value, or it is assigned a new value by an algebraic expression during simulation. There is no warning if a parameter is reassigned.

Algebraic parameter assignments can be made by an algebraic expression of real values, predefined function, user-defined function, or circuit or model values. A complex expression must be enclosed in single quotes to invoke the Star-Hspice algebraic processor unless the expression begins with an alphabetic character and contains no blank spaces. A simple expression consists of a single parameter name.

To use an algebraic expression as an output variable in a. PLOT, or. A user-defined function assignment is similar to the definition of an algebraic parameter definition.

Star-Hspice extends the algebraic parameter definition to include function parameters that are used in the algebraic that defines the function.