A 75 dB SNDR 10-MHz Signal Bandwidth Gm-C-Based Sigma-Delta Modulator With a Nonlinear Feedback Compensation Technique

Wideband ( ≥10 MHz) continuous-time (CT) sigma-delta (ΣΔ) modulators generally use active-RC filters. On the other hand, Gm-C-filters avoid the need of a power-hungry driving stage due to their small loading. At the moment, the major challenge for designing Gm-C-based ΣΔ modulator is the narrow linear input range due to the nonlinear Gm amplifier, which… CONTINUE READING