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This work proposes a novel adaptive background compensation scheme forfrequency interleaved digital-to-analog converters (FI-DACs). The technique isapplicable to high speed digital transceivers such as those used in coherentoptical communications. Although compensation of FI-DACs has been discussedbefore in the technical literature, adaptive background techniques have not yetbeen reported. The importance of the latter lies in their capability toautomatically compensate errors caused by process, voltage, and temperaturevariations in the echnology (e.g., CMOS, SiGe, etc.) implementations of thedata converters, and therefore ensure high manufacturing yield. The keyingredients of the proposed technique are a multiple-input multiple-output(MIMO) equalizer and the backpropagation algorithm used to adapt thecoefficients of the aforementioned equalizer. Simulations show that theimpairments of the analog signal path are accurately compensated and theireffect is essentially eliminated, resulting in a high performance transmittersystem.

Adaptive Background Compensation of FI-DACs with Application to Coherent Optical Transceivers