/// <summary>Synchronizes the RF and envelope signal generators, and initiates generation.</summary>
/// <param name="rfVsg">The open RFSG session corresponding to the RF signal generator.</param>
/// <param name="envVsg">The open RFSG session corresponding to the envelope signal generator.</param>
/// <param name="syncConfig">Specifies common settings used for synchronizing the RF and envelope signal generators.</param>
public static void InitiateSynchronousGeneration(NIRfsg rfVsg, NIRfsg envVsg, SynchronizationConfiguration syncConfig)
{
TClock tclk = new TClock(new ITClockSynchronizableDevice[] { rfVsg, envVsg });
// The PXIe-5840 can only apply positive delays so we have to establish an inital delay of -RFDelayRange/2 for TCLK to handle negative shifts as well
tclk.DevicesToSynchronize[0].SampleClockDelay = -syncConfig.RFDelayRange_s / 2.0;
rfVsg.Arb.RelativeDelay = syncConfig.RFDelayRange_s / 2.0 + syncConfig.RFDelay_s;
tclk.ConfigureForHomogeneousTriggers();
tclk.Synchronize();
tclk.Initiate();
}
/// <summary>
/// This example illustrates how to use RFSG drivers and envelope tracking APIs to configure envelope tracking.
/// </summary>
static void Main(string[] args)
{
#region Example Settings
// Select mode for use in the example
EnvelopeMode mode = EnvelopeMode.Detrough;
string waveformPath = @"C:\Users\Public\Documents\National Instruments\RFIC Test Software\Waveforms\LTE_FDD_DL_1x20MHz_TM11_OS4.tdms";
#endregion
#region Configure RF Generator
// Initialize instrument sessions
NIRfsg rfVsg = new NIRfsg("5840", true, false);
// Load up waveform
Waveform rfWfm = LoadWaveformFromTDMS(waveformPath);
// Configure RF generator
InstrumentConfiguration rfInstrConfig = InstrumentConfiguration.GetDefault();
ConfigureInstrument(rfVsg, rfInstrConfig);
DownloadWaveform(rfVsg, rfWfm);
ConfigureContinuousGeneration(rfVsg, rfWfm);
#endregion
#region Configure Tracker Generator
NIRfsg envVsg = new NIRfsg("5820", true, false);
// Configure envelope generator
EnvelopeGeneratorConfiguration envInstrConfig = EnvelopeGeneratorConfiguration.GetDefault();
TrackerConfiguration trackerConfig = TrackerConfiguration.GetDefault();
ConfigureEnvelopeGenerator(envVsg, envInstrConfig, trackerConfig);
Waveform envWfm = new Waveform();
switch (mode)
{
case EnvelopeMode.Detrough:
// Create envelope waveform
DetroughConfiguration detroughConfig = DetroughConfiguration.GetDefault();
detroughConfig.MinimumVoltage_V = 1.5;
detroughConfig.MaximumVoltage_V = 3.5;
detroughConfig.Exponent = 1.2;
detroughConfig.Type = DetroughType.Exponential;
envWfm = CreateDetroughEnvelopeWaveform(rfWfm, detroughConfig);
break;
case EnvelopeMode.LUT:
LookUpTableConfiguration lutConfig = new LookUpTableConfiguration
{
DutAverageInputPower_dBm = rfInstrConfig.DutAverageInputPower_dBm
};
// Todo - initialize lookup table
envWfm = CreateLookUpTableEnvelopeWaveform(rfWfm, lutConfig);
break;
}
ScaleAndDownloadEnvelopeWaveform(envVsg, envWfm, trackerConfig);
ConfigureContinuousGeneration(envVsg, envWfm, "PFI0");
#endregion
// Start envelope tracking
SynchronizationConfiguration syncConfig = SynchronizationConfiguration.GetDefault();
InitiateSynchronousGeneration(rfVsg, envVsg, syncConfig);
// Wait until user presses a button to stop
Console.WriteLine("Press any key to abort envelope tracking..");
Console.ReadKey();
AbortGeneration(envVsg);
AbortGeneration(rfVsg);
// Close instruments
rfVsg.Close();
envVsg.Close();
}
