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Analog-to-digital-converter

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Analog to digital converter

Details

Inventors: Sakamoto, Shigemi; Saito, Satoru;
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

An A/D converter comprises an integrator circuit adapted to receive a first negative reference voltage at a first node and act as a voltage follower and adapted to integrate a second reference voltage with a capacitor at a second mode, the second reference voltage is more positive than the first reference voltage, a comparator for comparing an integrator output with a ground level and an analog input level at a second mode, and a counter for counting clock pulses when an integrator output is between the ground level and the analog input level.

DETAILED DESCRIPTION It is accordingly the object of this invention to provide an analog to digital converter which assures a high-speed operation as well as permitling a high-precision output.
This object can be achieved by an analog to digital converter which comprises a circuit adapted to act as a voltage follower circuit at a first mode and to act as an integrator circuit producing an output of a predetermined slope at a second mode, a comparator for comparing the output of the integrator circuit with a reference level and an analog input level, and a counter for counting pulse signals during a time interval in which the output of the integrator circuit is present between the reference level and the analog input level.

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