Abstract
Temporal degradation of transistors due to aging causes mismatch in the current mirror, a matching-critical building block of current digital to analog converters (IDACs). This mismatch induces non-linearity in IDAC behavior and can cause nonmonotonicity in the worst case. This paper performs an application-driven analysis of IDAC aging within a feed-forward equalizer (FFE) context. The work first models the effect of aging-induced mismatch over IDAC performance metrics and analyzes the performance shifts of IDACs over different topologies and input distributions. Next, the work illustrates how IDAC aging affects FFE behavior and presents novel schemes for FFE calibration to counter the impact of IDAC aging effectively.
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