lcladder

LC ladder object

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Description

lcladder class creates an LC ladder object that you can add to an existing circuit. Create filters and calculate S-parameters of filters using lcladder class. You can also add the lcladder object to an existing circuit.

You can also use the lcladder object to convert the rffilter object to an LC ladder, LCLad = lcladder(rffiltobj), where rffiltobj is an rffilter object.

LC ladder representation

Creation

Syntax

lcobj = lcladder(topology,inductances,capacitances)
lcobj = lcladder(rffilterobj)
lcobj = lcladder(___,lcname)

Description

example

lcobj = lcladder(topology,inductances,capacitances) creates an LC ladder object, lcobj, with a topology, top, inductor values, l, and capacitor values, c.

lcobj = lcladder(rffilterobj) creates an LC ladder object, lcobj, with a name, lcname from an RF filter object, rffilter.

lcobj = lcladder(___,lcname) creates an LC ladder object, lcobj, with a name, lcname. lcname must be a character vector.

Properties

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Topology type of the LC ladder, specified as a one of the following character vector:

  • 'lowpasspi': Low-pass pi filter

  • 'lowpasstee': Low-pass tee filter

  • 'highpasspi': High-pass pi filter

  • 'highpasstee': High-pass tee filter

  • 'bandpasspi': Band-pass pi filter

  • 'bandpasstee': Band-pass tee filter

  • 'bandstoppi': Band-stop pi filter

  • 'bandstoptee': Band-stop tee filter

Set the topology type in the topology argument of the syntax.

Example: 'lowpasspi'

Inductor values in LC ladder, specified as a numeric scalar or vector in henries. Set the inductor value in the inductances argument of the syntax.

Example: 3.18e-8

Capacitor values in LC ladder, specified as a numeric scalar or vector in farads. Set the capacitor value in the c argument of the syntax.

Example: [6.37e-12 6.37e-12]

Name of LC ladder object, specified as a character vector. Set the name of the LC ladder in lcname argument of the syntax.

Example: 'lcfilter'

Number of ports in LC ladder object. specified as a scalar. This value is always 2.

Terminal names of LC ladder object, specified as the cell vector, {'p1+' 'p2+' 'p1-' 'p2-'}. An LC ladder object always has four terminals: two terminals associated with the first port ('p1+' and 'p1-') and two terminals associated with the second port ('p2+' and 'p2-').

Example: {'p1+' 'p2+' 'p1-' 'p2-'}

Parent circuit nodes connected to LC ladder object terminals, specified as a vector of integers. This property appears only after the LC ladder object is added to a circuit.

Note

"ParentNodes" are only displayed after the capacitor has been added

into a circuit.

Full path of the circuit to which the LC ladder object belongs, specified as character vector. This path appears only after the inductor is added to the circuit.

Note

"ParentPath" is only displayed after the capacitor has been added

into a circuit.

Object Functions

cloneCreate copy of existing circuit element or circuit object

Examples

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Open Live Script

Create a low-pass pi LC ladder object with inductor value of 3.18e-8 H and capacitor value of 6.37e-12 F. Calculate and plot the s-parameters.

L = 3.18e-8;
C = [6.37e-12 6.37e-12];
lpp = lcladder('lowpasspi',L,C)
lpp = 
  lcladder: LC Ladder element

        Topology: 'lowpasspi'
     Inductances: 3.1800e-08
    Capacitances: [6.3700e-12 6.3700e-12]
            Name: 'lcfilt'
        NumPorts: 2
       Terminals: {'p1+'  'p2+'  'p1-'  'p2-'}


freq = 0:1e6:1e9;
S = sparameters(lpp,freq);
rfplot(S)

This LC ladder can also be added to a circuit.

c = circuit;
add(c,[1 2 0 0],lpp)
setports(c,[1 0],[2 0])

See Also

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Introduced in R2013b

RF Toolbox Documentation

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