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ANALOG DIGITAL CONVERTER, A/D CONVERSION STAGE, METHOD FOR GENERATING DIGITAL SIGNAL CORRESPONDING TO ANALOG SIGNAL, AND METHOD FOR GENERATING SIGNAL INDICATING CONVERSION ERROR IN THE A/D CONVERSION STAGE

  • US 20090243900A1
  • Filed: 06/08/2007
  • Published: 10/01/2009
  • Est. Priority Date: 06/08/2006
  • Status: Active Grant
First Claim
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1. An analog-digital converter comprising:

  • first to N-th A/D conversion stages connected in series, each stage having a stage input and a stage output, each of the first to N-th A/D conversion stages including a sub A/D conversion circuit, a control circuit, a D/A converter and a gain stage, the sub A/D conversion circuit generating a digital signal of a predetermined number of bits in response to a signal from the stage input, the digital signal indicating a conversion result, the control circuit generating a control signal from the digital signal, the D/A converter generating a predetermined voltage in accordance with the control signal, the gain stage having a first input, a second input and an output, the first input of the gain stage receiving the signal from the stage input, the second input of the gain stage receiving one of the predetermined voltage and the signal from the stage input, the output of the gain stage being connected to the stage output, and the number “

    N”

    being 3 or 4;

    an analog input for receiving an analog signal;

    an input switch, connected between the analog input and the stage input of the first A/D conversion stage, for sampling first and second sample analog signals in first and second sampling periods, respectively;

    a cyclic switch, connected between the stage input of the first A/D conversion stage and the stage output of the N-th A/D conversion stage, for providing a path from the N-th A/D conversion stage to the first A/D conversion stage in a cycle period, the cycle period being different from the first and second sampling periods; and

    a digital operational circuit, the digital operational circuit receiving the conversion result from each of the first to N-th A/D conversion stages, the digital operational circuit generating an A/D conversion digital code, and the A/D conversion digital code indicating a analog/digital conversion result.

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