 The MDO4000 series products from Tektronix represent a new paradigm in instrumentation; the Mixed Domain Oscilloscope, or MDO. These are the first instruments that are designed specifically to make time correlated measurements between digital, analog, and RF signals simultaneously in both the time and frequency domain. In recent years, there has been an explosion in the use of wireless technology for data transfer. In almost every industry, wireless links are replacing or extending traditional wired communications. The proliferation of wireless technology is comprised of both licensed and unlicensed band technologies. Predominantly, a licensed band technology is used by a broadcaster or service provider (TV, radio, cell phone), while unlicensed technology operates over much shorter ranges in "free bands" (Bluetooth, Wireless LAN, Garage Door openers, remote keyless entry). Modern wireless systems use sophisticated modulation schemes. These modulation schemes are generally implemented by using digital signal processing, DSP, and can be expressed in Cartesian complex form of I (In-Phase) and Q (Quadrature) data which, in turn, is used to modulate the transmitted RF signal. Almost by definition, then, modern wireless technologies span both time and frequency domains. In addition, the signals exist in three domains: digital, analog, and RF. Click here to continue reading this application note. | 
