mixerIMT

R2026b

Create IMT mixer element

Since R2022a. Recommended over rfdata.mixerspur, rfckt.mixer, and rfdata.power.

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Description

Use the mixerIMT object to perform frequency translation defined in an intermodulation table (IMT) for a single-tone carrier mixed with a local oscillator (LO) signal. If you design an RF system using an rfbudget object or the RF Budget Analyzer app you can model an IMT mixer with the mixerIMT object and add it to the RF system. You can then export this element to RF Blockset™ or to an rfsystem System object™ for circuit envelope analysis.

Creation

Syntax

imt = mixerIMT
imt = mixerIMT(Name=Value)

Description

imt = mixerIMT creates an IMT mixer object with default property values.

imt = mixerIMT(Name=Value) sets Properties using one or more name-value arguments. For example, imt = mixerIMT(LO=5e6) sets the local oscillator frequency of an IMT mixer to 5 GHz. Properties not specified retain their default values.

example

Properties

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Name of the IMT mixer, specified as a string scalar or character vector.

Example: Name='imtmixer'

Data Types: char | string

Since R2024b

Mixer model, specified as one of the following:

  • 'poly' — Cubic polynomial model. (since R2026b)

  • 'rfsys' — RF system data model. This value is automatically set when you create a mixerIMT object using system data from a CSV file or using the rfSystemParameters object, rfPartSelector object, or RF Part Catalog app.. (since R2026b)

Data Types: char | string

Since R2026b

Mixer converter type, specified as one of the following:

  • 'Up' — Up converter

  • 'Down' — Down converter

Example: ConverterType='Down'

Data Types: char | string

Since R2026a

Sideband of a modulator, specified as either:

  • 'upper' — RF carrier frequency is higher than local oscillator frequency.

  • 'lower' — RF carrier frequency is lower than local oscillator frequency.

This table summarizes the mixer IMT operations when Sideband is set.

Input/OutputConverterTypeSidebandOperation
RF/IF'Down''lower'IF = LO - RF
'upper'IF = RF - LO
IF/RF'Up''lower'RF = LO - IF
'upper'RF = LO + IF

Example: Sideband='upper'

Reference input power, specified as a scalar in dBm.

Example: 'ReferenceInputPower=-15

Data Types: double

Nominal output power, specified as a scalar in dBm.

Example: NominalOutputPower=8

Data Types: double

Noise figure, specified as a scalar in dBm.

Example: NF=8

Data Types: double

Local oscillator frequency, specified as a real finite positive scalar in Hz.

Example: LO=2e9

Data Types: double

Input impedance, specified as a positive scalar in ohms.

Example: Zin=40

Data Types: double

Output impedance, specified as a positive scalar in ohms.

Example: Zout=40

Data Types: double

IMT spurs to plot, specified as a real square matrix.

Example: IMT=[99 99 80; 99 0 99; 99 80 99]

Use S2D file to design IMT mixer, specified as a numeric or logical 1 (true) or 0 (false).

Example: UseDataFile=1

Data Types: logical

File name of the S2D file, specified as a string scalar or a character vector.

Example: FileName='samplespur1.s2d'

Dependency

To enable this property, set UseDataFile to 1.

Data Types: string | char

This property is read-only.

Number of input and output ports, returned as a positive scalar.

Data Types: double

This property is read-only.

Terminals of the IMT mixer, returned as a cell array of strings.

Data Types: string

Object Functions

sparametersCalculate S-parameters for RF data, network, circuit, and matching network objects
rfplotPlot mixer spurs and spur-free zones of IMT mixer

Examples

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Open Live Script

Create an IMT mixer with the LO frequency of 5995 MHz and with the IMT spurs. 

imt = mixerIMT(LO=5995e6,IMT=...
     [99 17 13.6 42.9; 40 0 47.7 54.3; 50.4 58.5 61.3 72.2; 75 67.4 75 99]);

Plot the mixer spur at an input signal frequency of 1005 MHz.

rfplot(imt,1005e6)

Figure contains an axes object. The axes object with title Mixer Spurs, xlabel Frequency [GHz], ylabel Power [dBm] contains 2 objects of type stem. These objects represent Signal, Spurs.

Since R2024a

Open Live Script

Create a mixerIMT object and specify the IMT data.

m = mixerIMT(IMT= [99 17 11.6; 40 0 44.7; 51.4 58.5 61.3]);

Specify the RF bandwidth as 120 MHz and the IF bandwidth as 10 MHz as inputs to the rfplot function in order to visualize the spur and spur-free zones of the mixerIMT object.

rfplot(m,"Frequency",3.1e9,"RFBW",120e6,"IFBW",10e6)

Figure contains an axes object. The axes object with title Mixer Frequency Planning Graph, xlabel IF Center Frequencies (Hz), ylabel Spurious Regions (dBc) contains 22 objects of type patch. These objects represent SpursZone, SpursFreeZone.

Version History

Introduced in R2022a

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See Also

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