Mixer Performance Simulations: Difference between revisions

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**Set '''Modifier''' to '''dB20'''
**Set '''Modifier''' to '''dB20'''
**Click on the RF port in the schematic
**Click on the RF port in the schematic
*In the Analog Design Environment, enable the '''pss''' analysis
**Verify that both '''frf''' and '''flo''' are displated in the '''Fundamental tones''' section
**Select '''Beat Frequency''' and click '''Auto Calculated'''
***The beat frequency should be 200 MHz (your IF frequency)
**Select '''Number of harmonics''' under '''Output harmonics''' and fill in the value of 15
**Set the '''Accuracy Defaults (errpreset)''' to '''conservative'''
**Set the '''Additional Time for Stabalizatoin (tstab)''' to a time larger that the settling time of your system
***Run a short '''tran''' simulation to find the time when all of the voltages in your mixer have settled and there is no "ringing"
**Click OK
*Run the simulatoin


==LO Feed Through==
==LO Feed Through==

Revision as of 14:04, 7 April 2011

Conversion Gain

  • You must first instance ports for the RF, LO, and IF ports of the mixer (analogLib -> Sources -> Independent -> port). If your mixer requires differential inputs/outputs then refer to the separate tutorial on how to drive differential signals.
  • Edit the properties of the RF port
    • Set the Resistance to 50 Ω and the Port number to 1
    • Set the Source type to dc
    • Click OK
  • Edit the properties of the LO port
    • Set the Resistance to 50 Ω
    • Set the Port number to 2
    • Set the Source type to sine
    • Fill in the flo for the Frequency name 1
    • Frequency 1 should be either 2.2 GHz (for low-side injection) or 2.6 GHz (for high-side injection)
      • This is the frequency of the local oscillator signal
    • Fill in Amplitude 1 (Vpk) with the amplitude of your LO signal
    • Click OK
  • Edit the IF port
    • Set the Resistance to 50 Ω and the Port number to 3
    • Set the Source type to dc
    • Click OK
  • In the Analog Design Environment, enable the pss analysis
    • Verify that only flo is displated in the Fundamental tones section
    • Select Beat Frequency and click Auto Calculated
    • Select Number of harmonics under Output harmonics and fill in the value of 0
      • This number of ourput harmonics is required by the pxf analysis that we will use to perform the conversion gain simulation
    • Set the Accuracy Defaults (errpreset) to conservative
    • Set the Additional Time for Stabalizatoin (tstab) to a time larger that the settling time of your system
      • Run a short tran simulation to find the time when all of the voltages in your mixer have settled and there is no "ringing"
    • Click OK
  • In the Analog Design Environment, select pxf analysis (pxf stands for periodic transfer function)
    • Set Sweep type to default
    • Under Output Frequency Sweep Range (Hz) select Start-Stop
    • Set Start to 1 MHz and Stop to 400 MHz
  • Set the Sweep Type to Linear
    • Select Number of Steps and set the value to 1000
    • Set Sidebands to Maximum Sideband and enter the value 3
    • Under Output select probe and then selct the IF port
    • Click OK
  • Run the simulation
  • To view the results for the conversion gain simulatoin click Results -> Direct Plot -> Main Form ...
    • Set the Analysis to pxf
    • Set the Function to Voltage Gain
    • Set Sweep to sideband
    • Select sidebands -1 and 1 (hold down the ctrl key to select multiple sidebands)
      • This is the sideband that provides us the conversion gain of our RF frequency of interest
    • Set Modifier to dB20
    • Click on the RF port in the schematic
  • In the Analog Design Environment, enable the pss analysis
    • Verify that both frf and flo are displated in the Fundamental tones section
    • Select Beat Frequency and click Auto Calculated
      • The beat frequency should be 200 MHz (your IF frequency)
    • Select Number of harmonics under Output harmonics and fill in the value of 15
    • Set the Accuracy Defaults (errpreset) to conservative
    • Set the Additional Time for Stabalizatoin (tstab) to a time larger that the settling time of your system
      • Run a short tran simulation to find the time when all of the voltages in your mixer have settled and there is no "ringing"
    • Click OK
  • Run the simulatoin

LO Feed Through

  • You must first instance ports for the RF, LO, and IF ports of the mixer (analogLib -> Sources -> Independent -> port). If your mixer requires differential inputs/outputs then refer to the separate tutorial on how to drive differential signals.
  • Edit the properties of the RF port
    • Set the Resistance to 50 Ω and the Port number to 1
    • Set the Source type to sine
    • Enter frf for the Frequency name 1
    • Enter 2.4 GHz for Frequency 1
    • Enter prf for Amplitude 1 (dBm)
    • Click OK
  • Edit the properties of the LO port
    • Set the Resistance to 50 Ω
    • Set the Port number to 2
    • Set the Source type to sine
    • Fill in the flo for the Frequency name 1
    • Frequency 1 should be either 2.2 GHz (for low-side injection) or 2.6 GHz (for high-side injection)
      • This is the frequency of the local oscillator signal
    • Fill in Amplitude 1 (Vpk) with the amplitude of your LO signal
    • Click OK
  • Edit the IF port
    • Set the Resistance to 50 Ω and the Port number to 3
    • Set the Source type to dc
    • Click OK
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