Creating and Downloading an IQ Waveform to a RF Signal Generator
This example shows how to use the Quick-Control RF Signal Generator to generate and transmit RF waveforms.
In this example we will create an IQ waveform and transmit this waveform using the Quick-Control RF Signal Generator.
To run this example you need:
Keysight Technologies® N5172B signal generator
Keysight VISA version 17.3
IVI-C driver for Keysight Technologies N5172B signal generator
National Instruments™ IVI® compliance package version 188.8.131.52 or higher
Create IQ waveform
We will create an IQ waveform that consists of two sinusoid signals with real and imaginary values.
When generating signals for the RF Signal Generator ensure that the waveform is a continuous row vector.
% Configure parameters for waveform. % Number of points in the waveform points = 1000; % Determines the frequency offset from the carrier cycles = 101; phaseInc = 2*pi*cycles/points; phase = phaseInc * (0:points-1); % Create an IQ waveform Iwave = cos(phase); Qwave = sin(phase); IQData = Iwave+1i*Qwave; IQData = IQData(:)';
Create an RF Signal Generator Object
rf = rfsiggen();
Discover all the available instrument resources you can connect to, using the
ans = ' ASRL1::INSTR ASRL3::INSTR ASRL::COM1 ASRL::COM3 PXI0::MEMACC TCPIP0::172.28.22.99::inst0::INSTR TCPIP0::A-N5172B-50283.dhcp.mathworks.com::inst0::INSTR TCPIP0::A-N9010A-21026.dhcp.mathworks.com::inst0::INSTR '
Discover all the available instrument drivers, using
ans = 'Driver: AgRfSigGen_SCPI Supported Models: E4428C, E4438C Driver: RsRfSigGen_SCPI Supported Models: SMW200A, SMBV100A, SMU200A, SMJ100A, AMU200A, SMATE200A Driver: AgRfSigGen Supported Models: E4428C,E4438C,N5181A,N5182A,N5183A,N5171B,N5181B,N5172B N5182B,N5173B,N5183B,E8241A,E8244A,E8251A,E8254A,E8247C Driver: nisRFSigGen Supported Models:'
Connect to Signal Generator
Driver property before connecting to the object.
rf.Resource = 'TCPIP0::A-N5172B-50283.dhcp.mathworks.com::inst0::INSTR'; rf.Driver = 'AgRfSigGen'; % Connect to the instrument connect(rf);
Download the Waveform
Download the waveform,
IQData to the instrument with sampling rate of 10MHz.
samplingRate = 10e6; download(rf, IQData, samplingRate);
Transmit the Waveform
Transmit the downloaded waveform with center frequency of 1GHz and output power of 0dBm. Note these values are selected as reference values and is not intended to be recognized as standard values for transmitting any RF signals. Loop count represents the number of times the waveform should be repeated.
centerFrequency = 1e9; outputPower = 0; loopCount = Inf; start(rf, centerFrequency, outputPower, loopCount);
Stop Transmitting the Waveform
Once you have finished transmitting the signal, stop the transmission.
Close the connection of the signal generator and remove it from the workspace.
disconnect(rf); delete(rf); clear rf