Current-to-voltage integrator for analog-to-digital converter, and method
作者： Timothy V. Kalthoff , James L. Todsen
DOI:
关键词: Direct-coupled amplifier 、 Electronic engineering 、 Engineering 、 Op amp integrator 、 Operational amplifier 、 Reservoir capacitor 、 Integrating ADC 、 Operational transconductance amplifier 、 Charge amplifier 、 Decoupling capacitor
摘要: An integrating circuit includes an operational amplifier and capacitor which is decoupled from the output of precharged to a positive reference voltage before each integration cycle. During cycle decreases toward but not below ground. This allows be included as front-end integrator delta-sigma analog-to-digital converter that powered only by single power supply. In described embodiment, coupled input auto-zeroing stage provides negative feedback stabilize when disconnected during precharging bandwidth control couples larger compensation capacitance reduce RMS noise. correlated double sampling discharged zero while kT/C error charge injection voltages opposite polarity are stored on both capacitor. The switched into in series with automatically cancel present more accurate converter.
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