• Patent Title: SYSTEM AND METHOD OF EXTENDING INPUT RANGE OF ANALOG TO DIGITAL CONVERTER
  • Application No.: US18205250
    Application Date: 2023-06-02
  • Publication No.: US20240405780A1
    Publication Date: 2024-12-05
  • Inventor: Alphons LitjesErik Olieman
  • Applicant: NXP B.V.
  • Applicant Address: NL Eindhoven
  • Assignee: NXP B.V.
  • Current Assignee: NXP B.V.
  • Current Assignee Address: NL Eindhoven
  • Main IPC: H03M1/06
  • IPC: H03M1/06
SYSTEM AND METHOD OF EXTENDING INPUT RANGE OF ANALOG TO DIGITAL CONVERTER
Abstract:
An analog to digital converter including a digital to analog converter (DAC), a comparator, and a controller. The DAC includes a sample node and a capacitor array controlled by a digital control input. The comparator compares a voltage of the sample node with a reference voltage to generate a comparison value. The controller presets the digital control input, prompts the DAC to sample the input voltage onto the sample node, resets the digital control input, and performs a conversion by successively adjusting the digital control input based on the comparison value to determine a digital output. A preset value is subtracted from the digital output to provide an adjusted digital output. A sample predictor predicts the next sample to determine the preset value used to adjust the sample node within a full scale range after DAC reset.
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