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Ansys Designer RF Solutions for RF/Microwave Component and System Design

Ansys “Designer RF” Training Workshop 03_1: Designer System Receiver

1-2ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.

February 23, 2009Inventory #002593

© 2012 ANSYS, Inc. March 6, 201203_1-2 Release 7.0

• Receiver Exercise– In the Receiver exercise, you will create, analyze and display results for an

electrical system consisting of filters, amplifiers and mixers.

Receiver Exercise




• Starting Ansoft Designer– Click the Microsoft Start button, select All Programs, and select menu item

Ansoft > Designer 6> Designer 6.– OR double click on the Designer 6 icon on the Windows Desktop.

• Adding a System Design– When you first start Ansoft Designer, a new project will be automatically

added to the Project Tree.– Select the menu item Project > Insert System Design.– OR click the system toolbar icon to insert a system design.– OR right mouse click (RMC) on the project and select Insert System Design.

Receiver Exercise




• Adding a System Design (Cont.)– In the Choose Layout Technology dialog box, select

MS-RT duroid 5880(Er-2.20) 0.010 inch, 0.5 oz copper– Click the Open button.– A new, empty schematic opens in the Ansoft Designer schematic editor.

• Technology File– A technology file initializes a design with a

set of data to avoid repeated entry of commonly used information. This data consists of layers and stackup information for layout, configured libraries of components, and substrate definition(s) for circuit analysis.

– Users and foundries can customize Technology Files for their own manufacturing processes and simulation models.

Receiver Exercise




• Configure the Design Libraries– This system design will use circuit components, such as

filter and attenuators.– The circuit components have to be configured prior to being

used in a system design.• Select the menu item Tools > Configure Libraries…• Select the Circuit Elements from Available Libraries• Click on the >> button to configure the selected libraries• Click the Save as default radial check box to retain settings• Select OK to dismiss this dialog box• The Components tab should now include the Circuit Elements

Receiver Exercise




• Component Placement Method– To place components in general, you can either:

• Double click its icon, move your mouse cursor to the schematic window and left click where you want it• OR select, drag and drop a component in the schematic• OR right click its icon, select Place Component, move mouse cursor to the schematic and left click where you

want it• Note: As you move the mouse cursor to the schematic window, you will see that the cursor is accompanied by

the symbol of the component you choose to place. Before placing the component, use the R key to rotate. If a component is already placed, select it and use the CTRL-R key to rotate.

• You can continue to place more components of the same type by further clicking. To stop placing, hit the ESCkey.

• Go to the next page to begin placing components.

Receiver Exercise




• Component Placement– Placing band-pass filter components

• In the Components tab, under the System Libraries icon, expand the Circuit Elements > Filters icon. Expand both the Chebyshev and Butterworth sub-sections.

• Select Chebyshev Band-Pass Filter and place in schematic• Select Butterworth Band-Pass Filter and place in schematic

– Note: Place the components; do NOT connect them, yet.

Receiver Exercise




• Component Placement (Cont.)– Placing attenuator component

• In the Components tab, under the System Libraries icon, expand the Circuit Elements > Ideal Microwave icon. • Select Attenuator and place in schematic

Receiver Exercise




• Component Placement (Cont.)– Placing Amplifiers and Mixers

• In the Components tab, under the System Elements icon, expand the Nonlinear RF icon.

• Select Amplifier, Full Listing and place in schematic twice• Select Mixer, Full Listing and place in schematic

Receiver Exercise




• Component Placement (Cont.)– Add the input and output ports

• Select the menu item Draw > Interface Port• Place the first port (“Port1”) at the input and the next port (“Port2”) at the output as shown below.

– Adding Wiring to connect components• As you place the cursor near a pin of a component, it changes from an arrow to an X. This indicates that the

schematic editor is in the wiring mode. In the wiring mode:– Left click to start drawing a wire– Left click again to end the wire

• You can also invoke the wire drawing mode by selecting the Draw > Wire menu item, Wire Symbols toolbar button, or CTRL-W hotkey.

Receiver Exercise




Add SourceDefine the source for Port1 (input)

In the schematic editor, double click Port1 to open the Port Definition dialog box.In the Port Definition dialog box:

Click the radial button next to Microwave portClick the Add button to open the Source Selection dialog boxIn the Source Selection dialog box:

For property p, type Power in the value field. This will invoke the Add Variable dialog box. Type 10dBm and click OK.For property f, type Freq_in in the value field and type 10GHz for the default value,

when queried.Double click Port2 to open Port Definition dialog boxClick the Microwave Port radial button and click OK.

Receiver Exercise




• Edit Component Properties– Double click the schematic symbol for the first filter to open its Properties

dialog box and edit the value fields:• FL = 9.5GHz• FU = 10.5GHz• RIP = 3• Click the OK button for the Chebyshev filter

– Enter the parameter values for each of the remaining components as shown on the next page.

Receiver Exercise




RZ =5 0 O hm

IZ =0 O h m

PNUM=1

IZ =0 O hm

PNUM=2RZ =5 0 O hm

A =3

RO =10 0 O h m

A M P

MS 2 1 =1 0MS 1 2 =-2 0P1DB =1 0 dB mNF=3

M IXER

IN O U TL O

FL O =8G HzCO NV G A INMA G =-5NF=6

A M P

MS 2 1 =10MS 1 2 =-4 0P1DB =1 0 dB mNF=3

N=5FL =1 .9 G HzFU=f c u to f f

N=3FL =9 .5 G HzFU=1 0 .5 G HzRIP=3

• Edit Component Properties• First Filter (Chebychev; done on previous page)

– FL=9.5GHz– FU=10.5GHz– Rip=3

• First Amplifier:– Set MS11 = -10, MS21 = 10, MS12=-20, – Set NF = 3, P1DB = 10dBm

• Attenuator component– A=3– RO=100

• Mixer component– Set CONVGAINMAG = -5, – NF = 6– Set FLO = 8GHz

• Second Filter (Butterworth) – N=5– FL=1.9GHZ– FU=fcutoff (variable default = 2.1GHZ)

• Second Amplifier:– Set MS21 = 10, MS12 = -40, NF = 3, – Set P1DB = 10dBm

Receiver Exercise




• Note: the Amp and Mixer have multiple properties for defining both the linear and nonlinear behavior of these devices. In each case you can scroll through the lists in the Properties dialog. FYI some of the significant properties are listed here:

• Amplifier Properties– Amplifier Linear Properties

• Scattering Parameters (MSij, PSij)• Noise Figure (NF)

– Amplifier Nonlinear Properties• Output Intercept(OIP3, OIP2), Compression(P1DB) & PSAT• OIP3 and P1DB are mutually exclusive

• Mixer Properties– Mixer Linear Properties

• Scattering Parameters (MSij, PSij)• Noise Figure (NF)

– Mixer Nonlinear Properties• Output Intercept(OIP3, OIP2), Compression(P1DB) & PSAT

– Mixer Local Oscillator Properties• FLO, GLO• F1, F2, M2, FDEV

– Mixer Spurious Filtering Properties• MINF, MAXF, MINP, MAXO

Receiver Exercise




CW Tone Analysis SetupSelect the menu item System > Add Solution SetupIn the Analysis Setup dialog box:

Enter cwtone for the Analysis NameClick Next

In the System, Frequency Domain Analysis dialog box:Click the Finish button

Receiver Exercise




• Save Project– Select the menu item File > Save As or type CTRL-S.– From the Save As window, type the filename Receiver– Click the Save button

• Analyze the Project– Select the menu item System > Analyze

• OR right mouse click on the analysis and select Analyzein the Project Manager window to only run a specific analysis.

– Once the analysis starts, the Progress window – activates

– Notice the Message Manager status• Errors and warnings are reported here.

Receiver Exercise




• Budget Analysis Domain– Budget analysis displays a system response such as Noise Figure (NF) or Output Power (PO2) as a function of

components in the system. • First we’ll display Noise Figure (NF) through the Receiver

– Right click on the Results folder; select Create Standard Report > Rectangular Plot

• Report Dialog – Select Domain: Budget (upper left corner of the dialog)– Category: click on Noise – Quantity: select NF(format=cum)– Function: dB– Click: New Report– Click Done

Receiver Exercise




• A Budget plot of NF vs Receiver components – In the main menu select Window>Tile Horizontally

• Notice system NF increases through the system (left to right)– Click anywhere on the plot to Highlight the plot window– In the main menu select Report 2D>Accumulate

• Accumulate will display multiple traces resulting from multiple analyses

– Double click on the 2nd Amp (on the right) and increase NF to 6dB

– Re-analyze: in the Project Mgr right click on cwtone in the Analysis folder and click Analyze cwtone

– The new NF data resulting from the increased NF in the 2nd Amp will be displayed

Receiver Exercise




• Budget Analysis Domain– Next we’ll display a Budget plot of Power Output through the Receiver– Right click on the Results folder and select

Create Standard Report > Rectangular Plot

• Report Dialog – Select Domain: Budget (upper left corner of the dialog)– Category: click on Power – Quantity: select PO2(format=cum)– Function: dBm– Click: New Report– Click Done

Receiver Exercise




• A Budget plot of Power Output vs Receiver components – In the main menu select Window>Tile Horizontally

• Notice on the Budget plot from left to right that the System Power Output increases through the first Amp then decreases through the Attenuator and Mixer and then increases again through the final Amp. We’ll experiment again with the 2nd Amp to increase it’s gain and hopefully increase the overall Power Output.

– Click anywhere on the plot to Highlight the plot window– In the main menu select Report 2D>Accumulate– Double click on the 2nd Amp (on the right) and increase MS21 to 20dB– Re-analyze: Right click on cwtone in the Analysis folder and click Analyze cwtone– The new Power Output is displayed

• Notice that Power Output only increases by ~1dB even though we increased the small signal gain (MS21) by 10dB. This is due to the fact that the Amp is saturated.

• Double click on the Amp again and increase P1DB to 20dBm • Re-analyze• Notice now that the System Power Output has increased a lot since the Amp is no longer saturated. • Keep in mind that component properties such as Input and Output Return Loss of the Amps, Conversion Gain of the Mixer, and

Saturation characteristics of the Amps will all effect overall System results such as Noise Figure and Power Output.

Receiver Exercise




Swept Frequency Analysis SetupSelect the menu item System > Add Solution SetupIn the Analysis Setup dialog box:

Enter fsweep for the Analysis NameClick Next

In the System, Frequency Domain Analysis dialog box:Select Enable Group Delay CalculationsClick the Add buttonSelect freq_in from the variable picklistEnter a Linear step from 9GHz to 11GHz in 10MHz stepsClick the Add >> button

and then the OK buttonClick the Finish button

Receiver Exercise




Swept Power Analysis SetupSelect the menu item System > Add Solution SetupIn the Analysis Setup dialog box:

Enter psweep for the Analysis NameClick Next

In the System, Frequency Domain Analysis dialog box:Click the Add buttonSelect power from the variable picklistEnter a Linear step from -30dBm to 10dBm in 1dBm stepsClick the Add >> button and then the OK buttonClick the Finish button

Receiver Exercise




Multi-Dimensional Analysis SetupSelect the menu item System > Add Solution SetupIn the Analysis Setup dialog box:

Enter dualsweep for the Analysis NameClick Next

In the System, Frequency Domain Analysis dialog box:Select Enable Group Delay CalculationsAdd freq_in sweep from 9.5GHz to 10.5GHz in 20MHz stepsAdd fcutoff sweep from 2.1GHz to 2.2GHz in 20MHz stepsAdd single power point at 0dBmClick the Finish button

Select the menu item System > AnalyzeAs an alternative to nested sweeps, you can synchronize dimensions to sweep together.

This option would be good for monitoring constant IF outputs from a mixer.

Receiver Exercise




• Display Gain and Group Delay versus Frequency– Right click on the Results folder and select Create Standard Report > Rectangular Plot

– The Report dialog will appear– Select Solution: fsweep– Select Domain: sweep– Select: Category: S-Parameters; Quantity: S21; Function: dB– Click New Report– Don’t Close the dialog– Select: Category: Group Delay; Quantity: GD21; – Function: none– Click Add Trace– Click Close

Receiver Exercise




• Display Gain and Group Delay versus Frequency– Plot of S21 in dB and Group Delay through

the System

– Note that you can double click on either axis to bring up a dialog which allows you to customize the axis (e.g. Fonts, Scale etc; see dialog below)

– Similarly you can double click on any trace in theplot to bring up a dialog which allows you to customize the trace (e.g. Trace Width, Trace Color etc.)

Receiver Exercise




• Display System Compression– Right click on the Results folder and select Create Standard Report > Rectangular Plot

– The Report dialog will appear– Select Solution: psweep– Select Domain: Sweep– Select: Category: Power; Quantity: PO2;

Function: dBm– Click New Report– Don’t Close the dialog– Select: Category: S-Parameter; Quantity: S21;

Function: ang_deg– Click Add Trace– Click Close

Receiver Exercise




• Display System Compression– Plot of Power Out and Phase of S21 – The X Axis is Swept Power Input level to the Receiver System

– This plot shows AM/AM and AM/PM distortion in the System.– This distortion is caused by nonlinearities in the System introduced by the two Amplifiers and the Mixer.

Receiver Exercise




• Display Steady State Compression– Right click on the Results folder and select Create Standard Report > Rectangular Plot

– The Report dialog will appear– Select Solution: psweep– Select Domain: Time– Select: Category: Voltage; Quantity: V2; Function: none– Click the Families TAB (see next page)

Receiver Exercise




• Display Steady State Compression– The Families TAB enables you to plot data as a function of some swept variable (in this case swept power) in order to create

a Family of Data Traces.– In the Families TAB click on the … just below the

word “Edit” – Then Select Use all values (this will include one data

trace for each step in the power sweep).– Click New-Report– Click Close

– The plot contains one trace for each step in the power sweep.

– Notice the System signal distortion at the higher power levels.

– The Steady State Time Domain Results are calculated from an Inverse FFT of the System Spectral Response.

Receiver Exercise




• Display Multi-Dimensional Sweep– Right click on the Results folder and select Create Standard Report > 3D Rectangular Plot

– The Report dialog will appear– Select Solution: dualsweep– Select Domain: Sweep– Select: Category: S-Parameters – Quantity: S21 – Function: dB– Select New Report– Click Close

Receiver Exercise




• Display Multi-Dimensional Sweep– 3D Plots provide a convenient way to examine multiple swept parameters.– In this case we are looking the effect of the Cutoff freq of the 2nd Filter on the small signal gain of the System– Note that you can rotate the 3D Plot using ALT - Drag

Receiver Exercise

ws03 1 designer system receiver - cadfamily.com · workshop 03_1: designer system receiver. 1-2 ......

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