System and method for baseband calibration
View Patent ↗A system includes at least one of a first generator, at least two of a second generator, and a load board. The at least one of a first generator one of receives and transmits analog signals. The at least two of a second generator one of receives and transmits digital signals. The load board is disposed between the first generator and the second generators and electrically coupled therebetween to calibrate parameters relating to communications. The load board includes a direct path for each of the analog signals between the at least one of the first generator and a corresponding number of devices under test and for each of the digital signals between the at least two of the second generator and a corresponding number of devices under test.
1. A method for baseband I/Q calibration, comprising:
calibrating signals from one of at least one of a first generator one of receiving and transmitting analog signals and at least two of a second generator one of receiving and transmitting digital signals using a load board including a direct path for each of the analog signals between the at least one of the first generator and a corresponding number of devices under test and for each of the digital signals between the at least two of the second generator and a corresponding number of devices under test;
digitizing one of the analog signals and the digital signals that are in waveform;
determining a phase imbalance to be converted from degrees to a unit of time;
assigning the unit of time to one of an I and Q trigger delay as a function of the polarity of the phase imbalance.
2. The method of claim 1 , wherein the first generator is an arbitrary waveform generator.
3. The method of claim 2 , wherein the calibrating the signals for the arbitrary waveform generator includes using a calibrated double core analog signal digitizer to measure the I/Q signals from two separate arbitrary waveform generators.
4. The method of claim 1 , wherein the second generator is an analog signal digitizer.
5. The method of claim 4 , wherein the calibrating the signals for the analog signal digitizer is based on a differential output of a single arbitrary waveform generator.
6. The method of claim 1 , wherein the unit of time is assigned to the I signal when the polarity of the phase imbalance is in phase.
7. The method of claim 1 , wherein the unit of time is assigned to the Q signal when the polarity of the phase imbalance is quadrature phase.
8. The method of claim 1 , further comprising:
repeating the calibrating, the digitizing, the determining, and the assigning for each frequency, filter, and gain to be used.
9. The method of claim 1 , wherein the digitizing further comprises performing a complex Fast Fourier Transform for each local digital signal processing.