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AN3009: 产品描述S-Parameter S2P File Format; 文件大小28KB，共2页; 制造商MACOM; 官网地址http://www.macom.com

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AN3009概述

S-Parameter S2P File Format

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Application Note

AN3009

S-Parameter S2P File Format

Rev. V2

Introduction

Listed among many of M/A-COM’s products are files

that describe the small signal scattering matrix, or s-

parameters, of the device. The S2P format is an

industry standard and thus is recognized by many

simulation programs. This application note de-

scribes the basic file format. The general case of

the touchstone standard, not described in this appli-

cation note, extends to more than two ports. Touch-

stone is a registered trademark of Agilent corpora-

tion and is used with permission.

Comment Lines

Comment lines are denoted by a ‘!’ preceding the

text.

! This is a comment line

Comment lines are used optionally for description

and test conditions.

Data

The data consists of 9 columns. The first column is

always frequency with the units defined in the option

line. The next 8 columns define the two port

parameters for that given frequency. The order of

these parameters are:

<FREQ>

<X11>

Where X can be S, Z, Y, H, or G as defined in the

option line. The real or magnitude of the parameter

is listed first (denoted by the boldface), followed

immediately by the imaginary or phase (denoted by

the italicized). Phase angles are always measured

in degrees. These formats are also defined in the

option line.

S1P files describe a single reflection impedance.

There are only three columns denoted by

FREQ

X11

File Format Description

S2P files are ASCII text files. As such, they can be

viewed or edited by any standard text editor. The

files are not case sensitive.

Option Line

Each file generally has an option line that resembles

the following.

# GHZ S MA R 50

In the event that no option line is shown, the values

shown above are the defaults.

The ‘#’ defines the line as an option line.

‘GHZ’ defines the units of frequency used in the

data. GHZ, MHZ, KHZ, and HZ are acceptable val-

ues.

‘S’ is the type of parameter that has been measured.

Typically, this is the type of data the M/A-COM pro-

vides. Other possibilities include Y, Z, H, and G

which are well documented in many circuit analysis

textbooks.

‘MA’ is what format that the complex data is in.

DB:

Decibel Magnitude/Degree Angle

MA: Linear Magnitude/Degree Angle (polar form)

RI:

Real Part/Imaginary Part (rectangular form)

The ‘DB’ form decibel magnitude is computed as

20*Log(linear magnitude).

‘R 50’ define the system impedance at which the

measurements were taken. For CATV systems this

impedance will be 75 ohms. Normalized measure-

ments will have a value of 1 ohm.

Visit www.macomtech.com for additional data sheets and product information.

Noise Parameters

Noise parameters describe the noise circles of a

device. They are optionally included at the end of

an S2P file. There is not a separate option line for

noise parameters. The first frequency of the noise

parameters must be less than the highest frequency

of the two port parameters so the simulators can

distinguish where the two port data stops and the

noise data begins.

There are five columns that describe noise

parameters. The following describes the noise

parameter data format.

•

North America

Tel: 800.366.2266 •

Europe

Tel: +353.21.244.6400

•

India

Tel: +91.80.4155721

•

China

Tel: +86.21.2407.1588

M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make

changes to the product(s) or information contained herein without notice.

AN3009

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