At this time, DMT-modulated waveforms are not typically
menu-selectable items contained within AWGs. Even using
AWG software to generate DMT signals, AWGs that are available
today may not deliver DMT signals sufficient in performance
with regard to MTPR due to limitations in the D/A converters
and output drivers used by AWG manufacturers. Similar to
evaluating single-tone distortion performance of an amplifier,
MTPR evaluation requires a DMT signal generator capable of
delivering MTPR performance better than that of the driver
under evaluation. Generating DMT signals can be accomplished
using a Tektronics AWG 2021 equipped with Option
4, (12-/24-bit, TTL Digital Data Out), digitally coupled to
Analog Devices’ AD9754, a 14-bit TxDAC?, buffered by an
AD8002 amplifier configured as a differential driver. Note that
the DMT waveforms (available on the Analog Devices website,
http://www.analog.com), or similar .WFM files are needed to
produce the digital data required to drive the TxDAC from the
optional TTL Digital Data output of the TEK AWG2021.