Operational modes of high-speed DACs: analysis and mathematical modeling

Abstract

In most radioelectronic and telecommunication systems, signal generation is performed digitally. The transfer of such signals to the carrier frequency implies their conversion to an analog form. For this operation, digital-to-analog converters are used. An important problem of digital-to-analog conversion is the provision of a wide frequency band of the output signal. This problem is solved, mainly, either due to a significant increase in the clock rate of digital-to-analog converters, or by changing the operational modes of the converters. The article considers the main operational modes used in modern highspeed digital-to-analog converters for digital generation of broadband signals. Mathematical modeling of the operational modes is performed. The suggested variant of realization of impulse responses is investigated. The analysis of output signals of the digital signal generator in frequency domain is performed. The comparative characteristics of the considered modes are presented. Practical recommendations are given on the use of the considered operational modes for the formation of broadband signals.