High resolution digital spectroscopy based on multiple interleaved ADCs

Interleaved sampling is a well known technique for achieving a sampling speed by the synergy of more than one ADC clocked at frequency lower than the sampling one. This allows significant reduction of power consumption and increasing of achievable resolution with respect to the use of a single ADC. Main problem of interleaved ADC structures is the definition of a precise and stable relationship among sampling combs of the different ADCs. While consolidated integrated solutions exist for interleaved ADCs mismatches, at off-chip system level the problem is still open. We propose an active mechanism of tracking and maintaining the correct relative position of the sampling combs of the ADCs by means of a control architecture implemented in a field programmable gate array (FPGA) device.