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phaseshift

Create phase-shift circuit

    Description

    Use a phaseshift object to create a phase-shift circuit. The phaseshift object is a two-port network commonly used in image rejection receivers and digital beam steering applications.

    You can also use the phaseshift object to model a phase shift circuit in cascaded stages using an rfbudget object or the RF Budget Analyzer app.

    Creation

    Description

    example

    psh = phaseshift creates a phaseshift object with default values.

    example

    psh = phaseshift(Name=Value) sets Properties of the phaseshift object using one or more name-value arguments. For example, psh = phaseshift(phaseshift=80) creates an 80 degree phase shift circuit. Properties you do not specify retain their default values.

    Properties

    expand all

    Name of the phase shift circuit, specified as a string scalar or a character vector.

    Example: phaseshift(Name='phaseshiftObj')

    Phase angle difference between the input and the output signals expressed by the insertion phase angle, specified as a positive scalar in degrees.

    Example: phaseshift(phaseshift=80)

    This property is read-only.

    Number of input and output ports of the phase shift circuit, specified as a positive scalar.

    This property is read-only.

    Terminals of the phase shift circuit, specified as a cell array.

    Object Functions

    sparametersCalculate S-parameters for RF data, network, circuit, and matching network objects

    Examples

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    Create a 25 degree phase shift circuit for a radio receiver.

     psh = phaseshift(PhaseShift = 25);

    Calculate the S-parameters at 3 GHz.

     spar = sparameters(psh,3e9)
    spar = 
      sparameters: S-parameters object
    
           NumPorts: 2
        Frequencies: 3.0000e+09
         Parameters: [2x2 double]
          Impedance: 50
    
      rfparam(obj,i,j) returns S-parameter Sij
    
    

    Create an amplifier with a gain of 4 dB.

    a = amplifier(Gain = 4);

    Create a modulator with an OIP3 value of 13 dBm.

    m = modulator(OIP3 = 13);

    Create an n-port element using passive.s2p.

    n = nport('passive.s2p');

    Create a 40 degree phase shift element.

    psh = phaseshift(PhaseShift = 40); 

    Calculate the RF budget of a series of RF elements at an input frequency of 2.1 GHz, an available input power of –30 dBm, and a bandwidth of 10 MHz.

    b = rfbudget([a m n psh],2.1e9,-30,10e6);

    Use the show command at the command line to visualize the RF budget chain in the RF Budget Analyzer app. You can also do further analysis on this chain using the app. For more information, see RF Budget Analyzer.

    show(b)
    

    Introduced in R2021b