The DUT can be characterized using a complex RF signal, and different figure-of-merit related to a modulated signal excitation can be extracted. The growing complexity of wireless systems imposes a thorough and detailed characterization of RF power amplifiers using wideband signals. IQSTAR enables high-speed and signals quality measurements to evaluate DUT performances (EVM, ACPR, CCDF, PAPR…).

With full control of the vector signal generator, it is possible to set the modulation scheme manually with adequate settings and have IQSTAR recall the required state on the instrument. Otherwise, it is possible to generate an IQ waveform using IQSTAR Waveform Generator or any third-party software and use it directly in IQSTAR by loading a text file containing the columns “I” and “Q”.

The Signal analyzer, with appropriate options and power meters, are used to measure different parameters like:

  • Adjacent Channel Power Ratio (ACPR)
  • Error Vector Magnitude (EVM)
  • Complementary-Cumulative-Distribution-Function (CCDF)
  • Peak-to-Average Power Ratio (PAPR)
  • Spectrum


IQSTAR Modulation measurements support multiple combinations of vector signal generators and signal analyzers from different vendors, allowing the test engineers to switch between instruments seamlessly and reduce the cost of ownership as he does not have to learn a new instrument user interface.