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Excess Loop Delay (ELD) induced feedback DAC nonideality is a dominant factor causing error in the transfer function of CT ΣΔ modulators and eventually leading to instability. This paper will present a novel technique which aims to track the amount of excess loop delay, and compensate by using digital logic elements and an RC feedback network. A 2nd order CT ΣΔ modulator with 1-bit DAC was built at...
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