model s-凯发k8网页登录

model s-parameter network

libraries:
rf blockset / circuit envelope / elements

description

the s-parameters block models a network defined by s-parameters in the rf blockset™ circuit envelope simulation environment. the device can have up to 65 ports. for an introduction to rf simulation, see the example, .

note

if you specify more than eight ports, the block does not simulate noise.

the block models s-parameter data in the rf blockset environment by fitting a rational function to the specified data. for more information about rational fitting of s-parameters, see the rf toolbox™ function.

note

during the fitting procedure, the block sets the tendstozero and qlimit properties of the rational object to false and inf, respectively.

s-parameters block mask icons are dynamic and indicate the current state of the applied noise parameter. this table shows you how the icons on this block vary based on the state of the simulate noise parameter on the block.

simulate noise: `on`	simulate noise: `off`

to model rf complex baseband s-parameters in simulink, use the idealized baseband block.

examples

architectural design of a low if receiver system

use the rf blockset™ circuit envelope library to simulate the performance of a low if architecture with the following rf impairments: component noise

parameters

main

data source — data source
`data file` (default) | `network-parameters` | `rational model`

data source for s-parameters behavior, specified as one of the following:

data file — name of a touchstone file with the extension.s2p. the block ignores noise and nonlinearity data in imported files.
network-parameters — provide network parameter data such as s-parameters, y-parameters, and z-parameters with corresponding frequency and reference impedance (ohms) for the s-parameters.
rational model — provide values for residues, poles, and direct feedthrough parameters which correspond to the equation for a rational model

$f (s) = (\sum_{k = 1}^{n} \frac{c_{k}}{s - a_{k}} d) \begin{matrix} , & s = j 2 π f \end{matrix}$
.in this rational model equation, each c_k is the residue of the pole a_k. if c_k is complex, a corresponding complex conjugate pole and residue must also be enumerated. this object has the properties c, a, and d. you can use these properties to specify the residues, poles, and direct feedthrough parameters.

data file — name of network parameter data file
`simrfv2_unitygain.s2p` (default) | character vector

name of network parameter data file, specified as a character vector.

dependencies

to enable this parameter, select data file in data source tab.

network-parameter object — network parameter objects as data source
`off` (default) | `on`

select this parameter to use a network parameter object as the data source to model the s-parameters.

once you select this parameter, in the text box that opens, specify one of these:

network parameter object.
matlab^® base workspace variable or a simulink^® model workspace variable. the block evaluates if the specified variable is a network parameter object.

sparameters('default.s2p') is the default network parameter object when you select this parameter.

the network parameter objects that you can specify include:

sparameters