Dynamic element matching in low oversampling delta sigma ADCs

Four dynamic element matching (DEM) algorithms are compared for a second-order and a fifth-order Δ-Σ ADC with the internal DAC realized with two different configurations. Simulations show that both SNDR and SFDR are significantly increased by using a DAC configuration that implements more unit elements. It is also found that with different oversampling ratios and architectures, the four algorithms behave differently in terms of the achieved overall SNDR and SFDR.