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AD-converter-with-a-power-saving-circuit-and-its-control-method

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Details

Inventors: Yoshinaga, Chikashi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Young; Brian
Assistant Examiner: Nguyen; John
Attorney, Agent or Firm: Whitham, Curtis & Christofferson

The present invention provides an AD converter in which a first capacitor array is connected to one input of a comparator and a second capacitor array is connected to another input of the comparator and in which a charge proportional to an input analog signal level VAIN is accumulated in the first capacitor array. The AD converter comprises a level-adjusting capacitor whose one end is connected to the one input of the comparator to adjust a voltage of the one input of the comparator, to which the first capacitor array is connected, to a predetermined voltage; and switching means for switching a potential of another end of the capacitor to the potential that differs between a sampling mode and a comparison mode.

DETAILED DESCRIPTION It is an object of the present invention to provide an AD converter, as well as its control method, which removes the drawbacks of the prior art described above, reduces the power consumption of the bias source, and makes the high-speed operation possible at a low voltage.
It is anther object of the present invention to provide an AD converter, as well as its control method, which makes possible the stable operation without oscillation even when its components are laid out at a high integration density.
To achieve the above objects, an AD converter according to the present invention basically employs the technical configuration described below.
That is, a first mode of the AD converter according to the present invention is an AD converter in which a first capacitor array is connected to one input of a comparator and a second capacitor array is connected to another input of the comparator and in which a charge proportional to an input analog signal level is accumulated in the first capacitor array, the AD converter comprising: a level-adjusting capacitor whose one end is connected to the one input of the comparator to adjust a voltage of the one input of the comparator, to which the first capacitor array is connected, to a predetermined voltage; and switching means for switching a potential of another end of the capacitor to the potential that differs between a sampling mode and a comparison mode.
A second mode is an AD converter in which, in an input signal sampling mode, a first reference capacitor in which a charge proportional to an input analog signal level is accumulated is connected to one input to a comparator and a second reference capacitor is connected to another input of the comparator and in which, in a comparison mode, a predetermined voltage is applied from a resistor array to the first reference capacitor, the AD converter comprising: a level-adjusting capacitor whose one end is connected to the one input of the comparator to adjust a voltage of the one input of the comparator, to which the first reference capacitor is connected, to a predetermined voltage; and switching means for switching a potential of another end of the capacitor to the potential that differs between the sampling mode and the comparison mode

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