A cryogenic ADC operating down to 4.2K

  • Cretan Y
  • Merken P
  • Sansen W
 et al. 
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Abstract

A SAR ADC is designed to operate from room temperature down to 4.2K, as needed by cryogenic sensor systems. The ADC is robust to cryogenic temperature-induced transistor anomalies. It has an INL of -0.8 (0.5)LSB and DNL of 1.1 (0.4)LSB at 4.2K(300K). It draws 70muA for a 200pF output capacitor at 3kHz sampling rate and 5V supply

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