Abstract
In mixed analog/digital circuits, op-amp noise, aliased noise, crosstalk from digital circuits, and distortion limit the dynamic range available. Op-amp design, gain partitioning and layout are the key in achieving >25-dB signal-to-noise ratios in an analog path containing 25 op amps. The authors present methods used to maximize dynamic range and measured results obtained from ASIC (application-specific integrated-circuit) devices.