A linear active combiner enabling an interleaved 200 GS/s DAC with 44 GHz analog bandwidth

A linear active combiner with an analog bandwidth of 50 GHz is presented. It is well suited for interleaving the outputs of two digital-to-analog converters (DACs), because it features almost identical forward transmission of both channels and good isolation between the inputs. Featuring a high linearity it can generate output signals up to 1.6 V
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differential voltage swing with an effective number of bits (ENoB) of 6. The performance of the combiner is demonstrated by characterization of the standalone device and in a time interleaved DAC setup where a sampling rate of 200 GS/s with an analog bandwidth of 44 GHz and an ENoB of > 4.5 is achieved.