The MXG and EXG provide frequency coverage to 6 GHz and modulation bandwidths to 160 MHz or 120 MHz, respectively. This wide modulation bandwidth is available with EVM better than 0.4% and flatness better than ±0.2 dB, ample performance for even the most demanding design tasks.
The X-Series achieves this combination of bandwidth and accuracy through the use of an internal calibration source and factory-calibrated channel corrections that extend from the modulator through the RF output. Together, these technologies minimize I/Q errors to provide high dynamic range and modulation accuracy plus wide modulation bandwidth without user intervention such as manual I/Q adjustment.
Wide modulation bandwidth and high dynamic range provide user benefits when working with signals that are narrower. In today’s crowded spectral environment, receivers must cope with problems such as adjacent-channel interference and multiple types of blocking. For example, a modern smartphone can have three or more transceivers operating at the same time, and must operate in proximity to other devices of similar complexity. The X-Series’ wide-bandwidth modulator can produce a test signal composed of a complete spectral segment that includes the desired signal plus adjacent and alternate channels as potential interferers—and perhaps spurious or transient signals as well.
Automatic routines in the MXG and EXG can use information from a remote USB power sensor to build a measurement of the complex (I/Q) frequency response of the path from the signal generator to the DUT. A real-time ASIC can then perform inverse compensation on the modulated signal to correct the complex channel response at the DUT as shown in Figure