A Micropower Chopper—CDS Operational Amplifier

  title={A Micropower Chopper—CDS Operational Amplifier},
  author={Massimiliano Belloni and Edoardo Bonizzoni and Andrea Fornasari and Franco Maloberti},
  journal={IEEE Journal of Solid-State Circuits},
A low-power spur-free precision amplifier, which uses input chopping and correlated double sampling for demodulation, is presented. This circuit employs an AC coupling between the first and the second stage that removes the first stage offset without causing ripple. The input rail-to-rail circuit, fabricated in a mixed 0.18-0.5 μm CMOS technology, operates with supply ranging from 1.8 V to 5 V. The circuit achieves a simulated 168-dB DC gain with an overall current consumption of 14.4 μA. The… CONTINUE READING
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