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==Power Consumption==
Low Noise Amplifier Performance Simulations
*Ground both the input and output of your LNA. If there is no DC blocking capacitor at the output then leave it open-circuited.
*Using the Analog Design Environment choose to run a dc simulation and make sure that '''Save DC Operation Point''' is selected.
*Run the simulation. When it is finished click '''Results -> Print -> DC Operating Points'''
*Click on the DC voltage source and note the delivered power.


1. Power Consumption
==S-Parameter Simulations==
 
*You must first instantiate ports at both the input and output of the LNA '''(analogLib -> Sources -> Independent -> port)'''.
Ground both the input and output of your LNA. If there is no DC blocking capacitor at the output then leave it open-circuited.
*Edit the properties of the input port  
Using the Analog Design Environment choose to run a dc simulation and make sure that Save DC Operation Point is selected.
**Set the '''Resistance''' to 50 Ω and the '''Port number''' to 1.  
Run the simulation. When it is finished click Results -> Print -> DC Operating Points
**Set the '''Source type''' to dc.
Click on the DC voltage source and note the delivered power.
*Edit the properties of the output port
2. S-Parameter Simulations
**Set the '''Resistance''' to 50 Ω and set the '''Port number''' to 2.
 
**Set the '''Source type''' to '''dc'''.
You must first instantiate ports at both the input and output of the LNA (analogLib -> Sources -> Independent -> port).  
*In the Analog Design Environment and choose the '''sp''' analysis type.
Edit the properties of the input port  
**Click the '''Port Select''' button and select the input and output port on the schematic.
Set the Resistance to 50 Ω and the Port number to 1.  
**Set the '''Sweep Variable''' to '''Frequency'''
Set the Source type to dc.  
**Set the '''Sweep Range''' to '''Start-Stop''' and enter 1.5G for the '''Start''' value and 3.5G for the '''Stop''' value.
Edit the properties of the output port  
**Set the '''Sweep Type''' to Linear and the '''Number of Steps''' to 1000.
Set the Resistance to 50 Ω and set the Port number to 2.  
**Leave the '''Do Noise''' set to '''no'''.
Set the Source type to dc.  
**Click '''OK'''
In the Analog Design Environment and choose the sp analysis type.  
*Run the simulation
Click the Port Select button and select the input and output port on the schematic.  
*To plot the results click '''Results -> Direct Plot -> Main Form ...'''
Set the Sweep Variable to Frequency  
**Make sure that the '''Analysis''' is '''sp''' and the '''Function''' is '''SP'''
Set the Sweep Range to Start-Stop and enter 1.5G for the Start value and 3.5G for the Stop value.  
**Select '''Plot Type''' as '''Rectangular'''
Set the Sweep Type to Linear and the Number of Steps to 1000.  
**Set the '''Modifier''' to '''dB20'''
Leave the Do Noise set to no.  
**Now simply click the button corresponding to the parameter you wish to plot.
Click OK  
Run the simulation  
To plot the results click Results -> Direct Plot -> Main Form ...  
Make sure that the Analysis is sp and the Function is SP  
Select Plot Type as Rectangular  
Set the Modifier to dB20  
Now simply click the button corresponding to the parameter you wish to plot.  
3. Noise Figure using S-parameter Simulation
 
Follow steps 1 – 4d from the S-parameter simulation instructions above.
In the sp Choosing Analyses window, set Do Noise to yes
Select the Output Port
Select the Input Port
Click OK
Run the simulation
To plot the results click Results -> Direct Plot -> Main Form ...
Make sure that the Analysis is sp and the Function is NF
Set the Modifier to dB10
Click on Plot
4. IIP3 and 1-dB Compression Simulation
 
You must first instantiate ports at both the input and output of the LNA (analogLib -> Sources -> Independent -> port)
Edit the properties of the input port
Set the Resistance to 50 Ω
Set the Port number to 1
Source type should be sine
Fill in fund1 for the Frequency name 1
Frequency 1 should be 2.4G
This is the frequency of the desired signal
Fill in prf for Amplitude 1 (dBm)
This is a variable name (to be defined later) of the power of the input signal
Click on Display second sinusoid
Fill in fund2 for Frequency name 2
Frequency 2 should be 2.42G
This is the frequency of the second tone or “blocker”
Fill in prf for Amplitude 2 (dBm)
This sets the power of the blocker equal to the power of the input signal
Click OK
Edit the properties of the output port
Set the Resistance to 50 Ω and the Port number to 2
Set the Source type to dc
In the Analog Design Environment we need to enable the pss analysis
Verify that fund1 and fund2 are displayed in the Fundamental Tones section.
Select Beat Frequency and click Auto Calculated
The beat frequency should be 20 MHz, this is the greatest common divisor of fund1 and fund2
Select Number of harmonics under Output harmonics and fill in the value of 123
This field defines the number of harmonics of the beat frequency that the simulation will consider. For IIP3 tests we need to consider up to the frequency (2*2.42GHz – 2.4GHz = 2.44GHz). This means that we need 122 harmonics of the beat frequency (2.44GHz / 20MHz = 122). We use 123 harmonics to go one harmonic higher.
Set the Accuracy Defaults (errpreset) to conservative
Set the Additional Time for Stabilization (tstab) to 20n
This allows any startup transients to settle before calculating the IIP3
Click Sweep
Choose Variable and check no for Frequency Variable?
Fill in prf for the variable name
This is the variable defining the power of both the input and blocker signals
Check Start-Stop under Sweep Range and fill in -50 for Start and 0 for Stop
Set the Sweep Type to Linear and set the Step Size to 5
Click OK
Run the simulation
To view the results for IIP3 click Results -> Direct Plot -> Main Form ...
Set the Analysis to pss
Set the Function to IPN Curves
Make sure that Select Port ( fixed R(port) ) is set
Click Variable Sweep (“prf”) for Circuit Input Power
Enter -25 for Input Power Extrapolation Point (dBm)
Some experimentation might be in order. You want the resulting extrapolated line to match well with the straight portion of the IM3 components at low power.
Select Input Referred IP3 and Order 3rd
Select either 2.44G (2*2.42G – 2.4G) or 2.38G (2*2.4G – 2.42G) for the 3rd Order Harmonic
Select 2.4G for the 1st Order Harmonic
Select the output port on the schematic
You Should get a plot similar to Fig. 1 below
Note that I use AWD whereas the default waveform viewer in Cadence is Wavescan.
To View the results for the 1-dB compression point click Results -> Direct Plot -> Main Form ...
Set the Analysis to pss
Set the Function to Compression Point
Check that Select Port ( fixed R(port) ) is set
Select Output Power for Format
Enter 1 for Gain Compression (dB)
We are interested in the 1-dB compression point after all
Enter -25 for Input Power Extrapolation Point (dBm)
Again some experimentation might be in order
Select Input Referred 1 dB Compression
Under the 1st Order Harmonics select 2.4G
Select the output Port on the schematic
The resulting plot should look similar to Fig. 2 below.


==Noise Figure using S-parameter Simulation==
*Follow steps 1 – 4d from the S-parameter simulation instructions above.
*In the '''sp''' Choosing Analyses window, set '''Do Noise''' to '''yes'''
**Select the Output Port
**Select the Input Port
**Click '''OK'''
*Run the simulation
*To plot the results click '''Results -> Direct Plot -> Main Form ...'''
**Make sure that the '''Analysis''' is '''sp''' and the Function is '''NF'''
**Set the '''Modifier''' to '''dB10'''
**Click on '''Plot'''


==IIP3  and 1-dB Compression Simulation==
*You must first instantiate ports at both the input and output of the LNA (analogLib -> Sources -> Independent -> port)
*Edit the properties of the input port
**Set the '''Resistance''' to 50 Ω
**Set the '''Port number''' to 1
**'''Source type''' should be '''sine'''
**Fill in '''fund1''' for the '''Frequency name 1'''
**'''Frequency 1''' should be 2.4G
**This is the frequency of the desired signal
**Fill in '''prf''' for '''Amplitude 1''' (dBm)
**This is a variable name (to be defined later) of the power of the input signal
**Click on '''Display second sinusoid'''
**Fill in '''fund2''' for '''Frequency name 2'''
**'''Frequency 2''' should be 2.42G
**This is the frequency of the second tone or “blocker”
**Fill in '''prf''' for '''Amplitude 2 (dBm)'''
**This sets the power of the blocker equal to the power of the input signal
**Click '''OK'''
*Edit the properties of the output port
**Set the '''Resistance''' to 50 Ω and the '''Port number''' to 2
**Set the '''Source type''' to '''dc'''
*In the Analog Design Environment we need to enable the pss analysis
**Verify that fund1 and fund2 are displayed in the Fundamental Tones section.
**Select Beat Frequency and click '''Auto Calculated'''
***The beat frequency should be 20 MHz, this is the greatest common divisor of '''fund1''' and '''fund2'''
**Select Number of harmonics under '''Output harmonics''' and fill in the value of 123
***This field defines the number of harmonics of the beat frequency that the simulation will consider. For IIP3 tests we need to consider up to the frequency (2*2.42GHz – 2.4GHz = 2.44GHz). This means that we need 122 harmonics of the beat frequency (2.44GHz / 20MHz = 122). We use 123 harmonics to go one harmonic higher.
**Set the '''Accuracy Defaults (errpreset)''' to '''conservative'''
**Set the''' Additional Time for Stabilization (tstab)''' to 20n
***This allows any startup transients to settle before calculating the IIP3
**Click '''Sweep'''
**Choose '''Variable''' and check''' no''' for Frequency Variable?
**Fill in prf for the variable name
***This is the variable defining the power of both the input and blocker signals
**Check''' Start-Stop''' under '''Sweep Range''' and fill in -50 for '''Start''' and 0 for''' Stop'''
**Set the Sweep Type to Linear and set the '''Step Size''' to 5
**Click OK
*Run the simulation
*To view the results for IIP3 click''' Results -> Direct Plot -> Main Form ...'''
**Set the '''Analysis''' to''' pss'''
**Set the '''Function''' to '''IPN Curves'''
**Make sure that Select Port ( fixed R(port) ) is set
**Click Variable Sweep (“prf”) for Circuit Input Power
**Enter -25 for '''Input Power Extrapolation Point (dBm)'''
***Some experimentation might be in order. You want the resulting extrapolated line to match well with the straight portion of the IM3 components at low power.
**Select '''Input Referred IP3''' and '''Order 3rd'''
**Select either 2.44G (2*2.42G – 2.4G) or 2.38G (2*2.4G – 2.42G) for the 3rd Order Harmonic
**Select 2.4G for the '''1st Order Harmonic'''
**Select the output port on the schematic
**You Should get a plot similar to Fig. 1 below
***Note that I use AWD whereas the default waveform viewer in Cadence is Wavescan.
*To View the results for the 1-dB compression point click '''Results -> Direct Plot -> Main Form ...'''
**Set the '''Analysis''' to '''pss'''
**Set the '''Function''' to '''Compression Point'''
**Check that '''Select Port ( fixed R(port) )''' is set
**Select''' Output Power''' for '''Format'''
**Enter 1 for '''Gain Compression (dB)'''
***We are interested in the 1-dB compression point after all
**Enter -25 for '''Input Power Extrapolation Point (dBm)'''
***Again some experimentation might be in order
**Select '''Input Referred 1 dB''' Compression
**Under the '''1st Order''' Harmonics select 2.4G
**Select the output Port on the schematic
**The resulting plot should look similar to Fig. 2 below.




[[image:Figure1.png|700px|center]]
Figure 1: Sample IIP3 plot
Figure 1: Sample IIP3 plot


 
[[image:Figure2.png|700px|center]]
 
 
Figure 2: 1-dB Compression Point
Figure 2: 1-dB Compression Point

Latest revision as of 23:45, 15 March 2011

Power Consumption

  • Ground both the input and output of your LNA. If there is no DC blocking capacitor at the output then leave it open-circuited.
  • Using the Analog Design Environment choose to run a dc simulation and make sure that Save DC Operation Point is selected.
  • Run the simulation. When it is finished click Results -> Print -> DC Operating Points
  • Click on the DC voltage source and note the delivered power.

S-Parameter Simulations

  • You must first instantiate ports at both the input and output of the LNA (analogLib -> Sources -> Independent -> port).
  • Edit the properties of the input port
    • Set the Resistance to 50 Ω and the Port number to 1.
    • Set the Source type to dc.
  • Edit the properties of the output port
    • Set the Resistance to 50 Ω and set the Port number to 2.
    • Set the Source type to dc.
  • In the Analog Design Environment and choose the sp analysis type.
    • Click the Port Select button and select the input and output port on the schematic.
    • Set the Sweep Variable to Frequency
    • Set the Sweep Range to Start-Stop and enter 1.5G for the Start value and 3.5G for the Stop value.
    • Set the Sweep Type to Linear and the Number of Steps to 1000.
    • Leave the Do Noise set to no.
    • Click OK
  • Run the simulation
  • To plot the results click Results -> Direct Plot -> Main Form ...
    • Make sure that the Analysis is sp and the Function is SP
    • Select Plot Type as Rectangular
    • Set the Modifier to dB20
    • Now simply click the button corresponding to the parameter you wish to plot.

Noise Figure using S-parameter Simulation

  • Follow steps 1 – 4d from the S-parameter simulation instructions above.
  • In the sp Choosing Analyses window, set Do Noise to yes
    • Select the Output Port
    • Select the Input Port
    • Click OK
  • Run the simulation
  • To plot the results click Results -> Direct Plot -> Main Form ...
    • Make sure that the Analysis is sp and the Function is NF
    • Set the Modifier to dB10
    • Click on Plot

IIP3 and 1-dB Compression Simulation

  • You must first instantiate ports at both the input and output of the LNA (analogLib -> Sources -> Independent -> port)
  • Edit the properties of the input port
    • Set the Resistance to 50 Ω
    • Set the Port number to 1
    • Source type should be sine
    • Fill in fund1 for the Frequency name 1
    • Frequency 1 should be 2.4G
    • This is the frequency of the desired signal
    • Fill in prf for Amplitude 1 (dBm)
    • This is a variable name (to be defined later) of the power of the input signal
    • Click on Display second sinusoid
    • Fill in fund2 for Frequency name 2
    • Frequency 2 should be 2.42G
    • This is the frequency of the second tone or “blocker”
    • Fill in prf for Amplitude 2 (dBm)
    • This sets the power of the blocker equal to the power of the input signal
    • Click OK
  • Edit the properties of the output port
    • Set the Resistance to 50 Ω and the Port number to 2
    • Set the Source type to dc
  • In the Analog Design Environment we need to enable the pss analysis
    • Verify that fund1 and fund2 are displayed in the Fundamental Tones section.
    • Select Beat Frequency and click Auto Calculated
      • The beat frequency should be 20 MHz, this is the greatest common divisor of fund1 and fund2
    • Select Number of harmonics under Output harmonics and fill in the value of 123
      • This field defines the number of harmonics of the beat frequency that the simulation will consider. For IIP3 tests we need to consider up to the frequency (2*2.42GHz – 2.4GHz = 2.44GHz). This means that we need 122 harmonics of the beat frequency (2.44GHz / 20MHz = 122). We use 123 harmonics to go one harmonic higher.
    • Set the Accuracy Defaults (errpreset) to conservative
    • Set the Additional Time for Stabilization (tstab) to 20n
      • This allows any startup transients to settle before calculating the IIP3
    • Click Sweep
    • Choose Variable and check no for Frequency Variable?
    • Fill in prf for the variable name
      • This is the variable defining the power of both the input and blocker signals
    • Check Start-Stop under Sweep Range and fill in -50 for Start and 0 for Stop
    • Set the Sweep Type to Linear and set the Step Size to 5
    • Click OK
  • Run the simulation
  • To view the results for IIP3 click Results -> Direct Plot -> Main Form ...
    • Set the Analysis to pss
    • Set the Function to IPN Curves
    • Make sure that Select Port ( fixed R(port) ) is set
    • Click Variable Sweep (“prf”) for Circuit Input Power
    • Enter -25 for Input Power Extrapolation Point (dBm)
      • Some experimentation might be in order. You want the resulting extrapolated line to match well with the straight portion of the IM3 components at low power.
    • Select Input Referred IP3 and Order 3rd
    • Select either 2.44G (2*2.42G – 2.4G) or 2.38G (2*2.4G – 2.42G) for the 3rd Order Harmonic
    • Select 2.4G for the 1st Order Harmonic
    • Select the output port on the schematic
    • You Should get a plot similar to Fig. 1 below
      • Note that I use AWD whereas the default waveform viewer in Cadence is Wavescan.
  • To View the results for the 1-dB compression point click Results -> Direct Plot -> Main Form ...
    • Set the Analysis to pss
    • Set the Function to Compression Point
    • Check that Select Port ( fixed R(port) ) is set
    • Select Output Power for Format
    • Enter 1 for Gain Compression (dB)
      • We are interested in the 1-dB compression point after all
    • Enter -25 for Input Power Extrapolation Point (dBm)
      • Again some experimentation might be in order
    • Select Input Referred 1 dB Compression
    • Under the 1st Order Harmonics select 2.4G
    • Select the output Port on the schematic
    • The resulting plot should look similar to Fig. 2 below.


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Figure 1: Sample IIP3 plot

Error creating thumbnail: File missing

Figure 2: 1-dB Compression Point

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