Power Reduction in Continuous-Time Delta-Sigma Modulators Using the Assisted Opamp Technique

  title={Power Reduction in Continuous-Time Delta-Sigma Modulators Using the Assisted Opamp Technique},
  author={Shanthi Pavan and Prabu Sankar},
  journal={IEEE Journal of Solid-State Circuits},
The opamp in the first integrator of a high resolution single-bit continuous-time modulator has stringent slew rate requirements, which increases power dissipation. We introduce the “assisted opamp” integrator, which is a way of achieving low distortion operation with low power consumption. We present circuit implementations of our technique for single-bit modulators using NRZ and switched-capacitor-resistor (SCR) feedback DACs. Audio modulators designed in a 0.18 μm CMOS technology are used as… CONTINUE READING
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