A 75-MHz Continuous-Time SigmaDelta Modulator Employing a Broadband Low-Power Highly Efficient Common-Gate Summing Stage Academic Article uri icon

abstract

  • 2016 IEEE. A wide-bandwidth (BW) power-efficient continuous-time modulator (CT M) 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. This combination relaxes the specification requirements of the operational amplifier by making its required BW independent of the closed-loop gain. The proposed technique achieves optimum BW with reduced power consumption, making it functional for over gigahertz operation. Fabricated in a standard 40-nm CMOS technology, and clocked at 3.2 GHz, the CT M achieves a signal-to-noise-and-distortion ratio of 65.5 dB over 75-MHz BWwhile consuming 22.8 mW of power. The obtained Walden's figure of merits is 98 fJ/conv-step.

published proceedings

  • IEEE Journal of Solid-State Circuits

author list (cited authors)

  • Briseno-Vidrios, C., Edward, A., Shafik, A., Palermo, S., & Silva-Martinez, J.

citation count

  • 18

complete list of authors

  • Briseno-Vidrios, Carlos||Edward, Alexander||Shafik, Ayman||Palermo, Samuel||Silva-Martinez, Jose

publication date

  • January 1, 2016 11:11 AM