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rfckt.parallel

Parallel connected network

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Description

Use theparallelc类来表示线性射频网络对象onnected in parallel that are characterized by the components that make up the network. The following figure shows a pair of networks in a parallel configuration.

Parallel configuration networks

Creation

Syntax

h = rfckt.parallel
h = rfckt.parallel('Ckts',value)

Description

h = rfckt.parallelreturns a parallel connected network object whose properties all have their default values.

example

h = rfckt.parallel('Ckts',value)returns a cascaded network with elements specified in the name-value pair propertyCkts.

Properties

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Computed S-parameters, noise figure, OIP3, and group delay values, specified as rfdata.data object.Analyzed Resultis a read-only property. For more information, seeAlgorithms.

Data Types:function_handle

Circuit objects in network, specified as a cell array of object handles. All circuits must be 2-port. By default, this property is empty.

Data Types:char

Object name, specified as an1-by-Ncharacter array.Nameis a read-only property.

Data Types:char

Number of ports, specified as a positive integer.nportt is a read-only property. The default value is2.

Data Types:double

Object Functions

analyze Analyze RFCKT object in frequency domain
calculate Calculate specified parameters for rfckt objects or rfdata objects
circle Draw circles on Smith Chart
extract Extract specified network parameters from rfckt object or data object
listformat List valid formats for specified circuit object parameter
listparam List valid parameters for specified circuit object
loglog Plot specified circuit object parameters using log-log scale
plot Plot circuit object parameters on X-Y plane
plotyy Plot parameters of RF circuit or RF data on X-Y plane with two Y-axes
getop Display operating conditions
polar Plot specified object parameters on polar coordinates
semilogx Plot RF circuit object parameters using log scale forx-axis
semilogy Plot RF circuit object parameters using log scale fory-axis
smith Plot circuit object parameters on Smith chart
write Write RF data from circuit or data object to file
getz0 Calculate characteristic impedance of RFCKT transmission line object
read Read RF data from file to new or existing circuit or data object
restore Restore data to original frequencies
getop Display operating conditions
groupdelay Group delay of S-parameter object or RF filter object orRF Toolboxcircuit object

Examples

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Open Live Script

Create a network of transmission lines connected in parallel usingrfckt.parallel.

tx1 = rfckt.txline; tx2 = rfckt.txline; rfplel = rfckt.parallel('Ckts',{tx1,tx2})
rfplel = rfckt.parallel with properties: Ckts: {[1x1 rfckt.txline] [1x1 rfckt.txline]} nPort: 2 AnalyzedResult: [] Name: 'Parallel Connected Network'

Algorithms

Theanalyzemethod computes the S-parameters of theAnalyzedResultproperty using the data stored in theCktsproperty as follows:

  1. Theanalyzemethod first calculates the admittance matrix of the parallel connected network. It starts by converting each component network's parameters to an admittance matrix. The following figure shows a parallel connected network consisting of two 2-port networks, each represented by its admittance matrix.

    Two 2-port networks connected in parallel, each represented by its admittance matrix

    where

    [ Y ′ ] = [ Y 11 ′ Y 12 ′ Y 21 ′ Y 22 ′ ] [ Y ″ ] = [ Y 11 ′ ′ Y 12 ′ ′ Y 21 ′ ′ Y 22 ′ ′ ]

  2. Theanalyzemethod then calculates the admittance matrix for the parallel network by calculating the sum of the individual admittances. The following equation illustrates the calculations for two 2-port circuits.

    [ Y ] = [ Y ′ ] + [ Y ″ ] = [ Y 11 ′ + Y 11 ′ ′ Y 12 ′ + Y 12 ′ ′ Y 21 ′ + Y 21 ′ ′ Y 22 ′ + Y 22 ′ ′ ]

  3. Finally,analyzeconverts the admittance matrix of the parallel network to S-parameters at the frequencies specified in theanalyzeinput argumentfreq.

References

[1] Ludwig, R. and P. Bretchko,RF Circuit Design: Theory and Applications, Prentice-Hall, 2000.

Version History

Introduced before R2006a

See Also

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