A/D converter with reduced power consumption
AssigneeFujitsu Limited
InventorsHiroshi Takakusagi, Toshitaka Mizuguchi, Chikara Tsuchiya, Katsuyosi Yamamoto
Life of this patent
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Abstract
An A/D converter includes a plurality of comparators, each of which samples an analog input potential during a first period, and compares the analog input potential with a reference potential during a second period, an encoder which encodes comparison results obtained by the comparators, and a control signal supply unit which generates one or more control signals that define the first period and the second period such as to make a duration of the first period different from a duration of the send period, and supplies the one or more control signals to the plurality of comparators.
Claims13
An A/D converter, comprising:
- a plurality of comparators, each of which samples an analog input potential during a first period, and compares the analog input potential with a reference potential during a second period;
- an encoder which encodes comparison results obtained by said comparators;
- and
- a control signal supply unit which generates one or more control signals that define the first period and the second period such as to make a duration of the first period different from a duration of the send period, and supplies the one or more control signals to said plurality of comparators.
A system, comprising:
- an A/D converter which converts an analog input signal into a digital signal;
- a digital processing unit which processes the digital signal output from said A/D converter;
- and
- a pulse-width adjustment unit, wherein said A/D converter includes:
- a plurality of comparators, each of which samples an analog input potential during a first period, and compares the analog input potential with a reference potential during a second period;
- an encoder which encodes comparison results obtained by said comparators;
- and
- a control signal supply unit which generates one or more control signals that define the first period and the second period such as to make a duration of the first period different from a duration of the send period, and supplies the one or more control signals to said plurality of comparators, wherein said pulse-width adjustment unit is configured to adjust the duration of the first period.
A comparator which samples an analog input potential during a first period, and compares the analog input potential with a reference potential during a second period, comprising:
- a condenser;
- an inverter connected to a first end of said condenser;
- a first switch connecting between a second end of said condenser and the analog input potential;
- a second switch connecting between the second end of said condenser and the reference potential;
- and
- a third switch which couples together an input of said inverter and an output of said inverter, wherein said first switch and said third switch are closed during the first period and said second switch is closed during the second period, the first period and the second period being controlled such as to have different lengths from each other.
Dependencies are inferred from the claim text.