A 75-MHz Continuous-Time Sigma-Delta Modulator Employing a Broadband Low-Power Highly Efficient Common-Gate Summing Stage.

A wide-bandwidth (BW) power-efficient continuous-time ΣΔ modulator (CTΣΔM) is presented. The modulator introduces a third-order filter implemented with a lossless integrator and a multiple-feedback single-amplifier biquadratic filter with embedded loop stability compensation. An active summing block is implemented by employing a common-gate current buffer followed by a transimpedance amplifier. Th...