feature of DDS-based arbitrary waveform generators is that their digital nature allows multiple channels to be operated with precisely controlled phase offsets or ratio-related frequencies. This allows the generation of polyphase sine waves, I-Q constellations, or simulation of signals from geared mechanical systems such as jet engines. Complex channel-channel modulations are also possible. Some AWG models include various detection schemes to adjust output waveforms in real time based on different kind of measurement results obtained for instance by signal demodulation, photon counting or triggering with an oscilloscope. The integration for signal generation and detection helps to minimize feedback times for demanding applications as for example in certain implementations of quantum error correction and quantum teleportation. See also Digital Pattern Generator References External links AWG primer XYZs of Signal Generators Electronic test equipment