RF Budget Analyzer

Analyze gain, noise figure, IP2, and IP3 of cascaded RF elements and export toRF Blockset

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Description

TheRF Budget Analyzerapp analyzes the gain, noise figure, and nonlinearity of proposed RF system architecture.

Using this app, you can:

Build a cascade of RF elements.
计算per-stage and cascade output power, gain, noise figure, SNR, and IP3 of the system.
Compute nonlinear effects such as output power, IP2, NF, and SNR using harmonic balance analysis.

Note

SNR calculation of an RF chain inRF Budget Analyzerapp uses 290K as a reference temperature.
Plotrfbudgetresults across bandwidths and over stages.
Plot S-parameters of the RF System on a Smith chart and a polar plot.
Plot magnitude, phase and real, and imaginary parts of S-parameters of the RF System and over stages.
Export per-stage and cascade values to the MATLAB^®workspace.
Export the system design to RF Blockset™ for simulation.

Note

If you use a stripline element in your system, then the app does not support exporting your system to RF Blockset.
Export the system design to the RF Blockset Testbench as a device under test (DUT) subsystem and verify the results using simulation.

Note

If you use an antenna element, the app does not support exporting to a testbench in the RF Blockset using theMeasurement Testbenchoption.
Export the system design torfsystemsystem object.
Visualize budget results and S-parameters over stages and frequencies.
Compare Friis and harmonic balance budget results.

Available Blocks

The app toolstrip contains these nonlinear elements that you can use to create an RF system:

Amplifier
Modulator
Demodulator
Generic

The app toolstrip contains these linear elements that you can use to create an RF system:

S-Parameters
Filter
Transmission Line
Series RLC
Shunt RLC
Attenuator
Transmitter Antenna
Receiver Antenna
Transmit-Receive Antenna
LC Ladder
Phase Shift

Available Templates

The app toolstrip contains these templates that you can use to design a transmitter or a receiver system:

Receiver
Transmitter

Open the RF Budget Analyzer App

MATLAB Toolstrip: On theAppstab, underSignal Processing and Communications, click the app icon.
MATLAB command prompt: EnterrfBudgetAnalyzer.

Examples

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RF Transmitter System Analysis

Open Live Script

Design and analyze an RF transmitter using theRF Budget Analyzerapp.

EnterrfBudgetAnalyzer打开应用程序。

Use theTransmittertemplate to create a basic transmitter.

发射机模板显示如下。

InSystem Parameters, specify the RF transmitter requirements:

Input Frequency—815MHz
Available Input Power—0dBm
Signal Bandwidth—100MHz

Click theIFAmplifierin the design canvas. Delete it using theDelete Elementbutton on the toolstrip.

Add aGenericelement in the place of theIFAmplifierusing the toolstrip. In theElement Parameterspane, specify:

Name—IFFilter
Available Power Gain—-3.6dB
SelectApply.

Click theModulatorelement. In theElement Parameterspane, specify:

Name—Mixer
Available Power Gain—-6.5dB
OIP3—11.5dBm
LO Frequency—4.97GHz
Converter Type—Up
SelectApply.

Delete theS-Parameterselement namedBandpassFilter. Add aGenericelement. In theElement Parameterspane, specify:

Name—RFFilter1
Available Power Gain—-1.4dB
SelectApply.

Select thePowerAmplifierelement and in theElement Parameterspane, specify:

Name—PowerAmplifier1
Available Power Gain—20dB
OIP3—43dBm
SelectApply.

Add anotherAmplifierelement using the toolstrip. In theElement Parameterspane, specify:

Name—PowerAmplifier2
Available Power Gain—20dB
OIP3—43dBm
SelectApply.

Add anotherGenericelement. In theElement Parameterspane, specify:

Name—RFFilter2
Available Power Gain—-1.4dB
SelectApply.

Save the system. The app saves the system in a MAT file.

Plot the output power of the transmitter using the3D Plotbutton. Select3D Plotand chooseOutput Power - Pout.

使用传输天线射频发射机的设计

This example uses:

Open Live Script

This example uses an RF transmitter design from theRF Transmitter System Analysisexample.

Follow the RF Transmitter System Analysis example to design an RF transmitter. Select the antenna element from theElementssection and add the element at end of this RF transmitter. In theElement Parameterspane, selectAntenna Designerfrom theAntenna Sourcedrop-down list.

ClickCreate Antennain theElement Parameterspane.

TheAntenna Designerapp opens. ClickNewto explore the antenna library. This example uses adipoleFoldedantenna element with a center frequency of815MHz. To do this, selectFoldedelement from theAntenna Gallery, setDesign Frequencyto815MHz, and clickAccept.

The updated antenna shows in the window.

ClickUpdate Elementto update theAntennaelement in theRF Budget Analyzerapp. ClickOKin the Confirm Update dialog box.

TheAntenna Designerapp window closes and theAntennaelement is updated in theRF Budget Analyzerapp. TheResultspane is automatically updated for Friis analysis withEIRPandDirectivityof theAntennaelement.

RF Receiver System Analysis

Open Live Script

Design and analyze an RF receiver using theRF Budget Analyzerapp.

EnterrfBudgetAnalyzer打开应用程序。

Use theReceivertemplate option to create a basic receiver.

The receiver template is displayed as follows:

InSystem Parameters, specify the RF receiver requirements:

Input Frequency—5.745MHz
Available Input Power—-65dBm
Signal Bandwidth—100MHz

ClickRFFilterin the design canvas. ThisRFFilteris anS-parameterselement. It accepts a Touchstone® file in the S2P file type. Update theElement parameterspane as follows:

Name:BandpassFilter
S2P file:Choose an S2P file by clicking theBrowsebutton.
SelectApply.

Click theRFAmplifierelement. In theElement Parameterspane, specify the element requirements:

Name—LNA1
Available Power Gain—12dB
OIP3—20dBm
SelectApply.

Add anotherAmplifierelement using the toolstrip. In theElement Parameterspane, specify the element requirements:

Name—LNA2
Available Power Gain—12dB
OIP3—20dBm
SelectApply.

Add aGenericelement. In theElement Parameterspane, specify the element requirements:

Name—IRFilter
Available Power Gain—-4.05dB
SelectApply.

Click theDemodulatorelement. In theElement Parameterspane, specify the element requirements:

Name—Mixer
Available Power Gain—-6.5dB
OIP3—11.5dBm
LO Frequency—4.93GHz
Converter Type—Down
SelectApply.

Delete theIFFilter,S-parameterselement. Add aGenericelement in its place. In theElement Parameterspane, specify the element requirements:

Name—CSFilter
Available Power Gain—-9.55dB
SelectApply.

Click theIFAmplifierelement. In theElement Parameterspane, specify the element requirements:

Name—PowerAmp1
Available Power Gain—16dB
OIP3—26dBm
SelectApply.

Add two moreAmplifierelements. For each element, in theElement Parameterspanes specify the element requirements:

Name—PowerAmp2|PowerAmp3
Available Power Gain—16dB |20dB
OIP3—26dBm |33dBm
SelectApply.

Save the system. The app saves the system in a MAT file.

Plot the output OIP3 of the receiver using the3D Plotbutton. Select the3D Plotbutton and chooseOutput Third-Order Intercept Point - OIP3.

Compare Friis and Harmonic Balance Solver

Open Live Script

Create an amplifier with a gain of 4 dB.

a = amplifier('Gain',4);

Create a modulator with an OIP3 of 13 dBm.

m = modulator('OIP3',13);

Create annportusingpassive.s2p.

n = nport('passive.s2p');

Create an RF element with a gain of 10 dB.

r = rfelement('Gain',10);

计算rfbudgetof 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 r n],2.1e9,-30,10e6);

Run this command in the command window, to open the system inRF Budget Analyzerapp.

show(b)

SetOIP2value ofAmplifierto60dBm usingElements Parameterspane and selectApply. InSystem Parameterssection, set theAvailable Input Powerto50dBm and run harmonic balance analysis usingHB-Analyzebutton.

The results are displayed as shown below.

SelectAuto-Analyzecheckbox to automatically recompute the harmonic balance analysis calculations.

SetOIP2value ofRFelementas50dBm usingElements Parameterspane and selectApply.

SelectCompare Viewcheckbox in theResultspane to compare the calculated Friis and harmonic balance solver results. You can useSelect Resultsdrop-down from theResultspane to filter the results and to compare between Friis and harmonic balance solver.

Design Input Matching Network Using Transmission Line Element

Open Live Script

Design an input matching network for a two-stage amplifier using theTransmission Lineelement in theRF Budget Analyzerapp.

EnterrfBudgetAnalyzer打开应用程序。

InSystem Parameters, specify the requirements:

Input Frequency—2.45GHz
Available Input Power—0dBm
Signal Bandwidth—2GHz

Add twoTransmission Lineelements. In theElement Parameterspane, specify:

Name—Microstrip1|Microstrip2
Type—microstrip|microstrip
Width—0.0034173|0.0034173meters
Height—0.001524|0.001524meters
Thickness—3.5e-06|3.5e-06meters
EpsilonR—3.48|3.48
LossTangent—0.0037|0.0037meters
SigmaCond—Inf|InfS/m
LineLength—0.0089|0.0147meters
StubMode—Shunt|NotAStub
Termination—Open
SelectApply.

Add twoS-Parameterselements. In theElement Parameterspane, specify:

Name—Sparams1|Sparams2

Load the Touchstone® file (f551432p.s2p) to theS-Parameterselements provided in this example and selectApply.

Plot the input reflection coefficient of the system using the3D Plotbutton. Select the3D Plotbutton, chooseS-Parametersand selectS11.

Plot S-Parameters, Output Power, and Transducer Gain of RF System

Open Live Script

Design an RF system and plot S-parameters, output power, and transducer gain usingRF Budget Analyzerapp.

EnterrfBudgetAnalyzer打开应用程序。

InSystem Parameters, specify the requirements:

Input Frequency—2.1GHz
Available Input Power—-30dBm
Signal Bandwidth—45MHz

Add aS-Parameterselement. In theElement Parameters, specify:

Name—RFBandpassFilter

Load the Touchstone® file (RFBudget_RF.s2p) to theS-Parameterselement provided in this example and selectApply.

Add anAmplifierelement. In theElement Parameters, specify:

Name—RFAmplifier
Available Power Gain—11.53dB
NF—1.53dB
OIP3—35dBm
SelectApply.

Add theDemodulatorelement. In theElement Parameters, specify:

Name—Demodulator
Available Power Gain—-6dB
NF —4dB
OIP3—50dBm
LO Frequency—2.03GHz
Converter Type—Down
SelectApply.

Add anotherS-Parameterselement. In theElement Parameters, specify:

Name—IFBandpassFilter

Load the Touchstone file (RFBudget_IF.s2p) to theS-Parameterselement provided in this example and selectApply.

Add anotherAmplifierelement. In theElement Parameters, specify:

Name—IFAmplifier
Available Power Gain—30dB
NF—8dB
OIP3—37dBm
SelectApply.

Save the system. The app saves the system in a MAT file.

SelectS-Parameters Plotbutton. This allows you to plot Smith® chart, polar plot, magnitude, phase and real, and imaginary parts of S-parameters of the RF System and over stages.

Set thePlot Bandwidthto75andResolutionto250underPlotssection.

The S-parameters data is displayed as follows.

SelectPhase (deg)from the drop-down menu of XY Plot inS-Parameterspane to plot the phase of the S21.

The phase plot is displayed as shown.

Plot the output power of the RF system using the2D Plotbutton. Select2D Plotbutton and chooseOutput Power - Pout.

2-D output power is displayed.

Plot the transducer gain of the RF system using the2D Plotbutton. Select2D Plotbutton and chooseTransducer Gain - GainT.

Perform HB Analysis on RF Receiver Designed Using`rfsystem`

This example uses:

Open Script

Design an RF receiver using therfsystemsystem object. View the object in the theRF Budget Analyzerapp to perform harmonic balance (HB) analysis.

Create fifth- and seventh-order bandpass RF filters.

f1 = rffilter('ResponseType','Bandpass','FilterOrder',5,...'PassbandFrequency',[4.85 5.15]*1e9); f2 = rffilter('ResponseType','Bandpass','FilterOrder'7...'PassbandFrequency',[10 130]*1e6);

Create two amplifier objects with3dB and5dB gain, respectively.

a1 = amplifier('Gain',3,'NF',1.53,'OIP3',35); a2 = amplifier('Gain',5,'NF',8,'OIP3',37);

Create a modulator with a local frequency of4.93GHz.

d = modulator('Gain',0,'NF',4,'OIP3',50,'LO',4.93e9,...'ConverterType','Down');

Design an RF receiver with the budget elements at an input frequency of5GHz, an available input power of –30dBm, and a bandwidth of10MHz.

rfb = rfbudget([f1 a1 d f2 a2],5e9,-30,10e6);

Create an RF system for the RF receiver using therfbudgetobject.

rfs = rfsystem(rfb);

Open an RF Blockset model of the designed RF system using theopen_systemobject function.

open_system(rfs)

Type rfBudgetAnalyzer(rfs) command at the MATLAB® command line to open this RF system in theRF Budget Analyzerapp.

To conduct HB analysis in the app, click theHB-Analyzebutton.

Related Examples

Programmatic Use

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