Analog digital converter
AssigneeKabushiki Kaisha Toshiba
InventorSatoshi Sakurai
Life of this patent
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Abstract
In one aspect, provided is an A/D converter including: a plurality of capacitor networks each including a first switch group a capacitor group; a second switch group; and a plurality of reference voltage selectors; a sampling unit grounded at one end thereof; a plurality of A/D converters; and converting means; and a plurality of switch networks each of which connects a corresponding one of the plurality of the capacitor networks to any one of the sampling unit and the plurality of A/D converters in one-to-one correspondence, and in which converter the switch networks change the connections between the plurality of capacitor networks, the sampling unit and the plurality of A/D converters, at each predetermined time intervals, so that a pipeline operation is performed.
Claims6
An analog-to-digital converter, comprising:
- a plurality of capacitor networks each including a first switch group configured to be connected to an input terminal into which an analog signal is inputted;
- a capacitor group configured to be connected to the first switch group, and configured to store the analog signal inputted from the input terminal as a charge;
- a second switch group configured to be connected to the capacitor group, and configured to transfer the charge in the capacitor group;
- and a plurality of reference voltage selectors configured to be connected to the first switch group and the capacitor group, and each of which selects a predetermined voltage in accordance with the digital value;
- a sampling unit grounded at one end thereof;
- a plurality of A/D converters each including:
- a operational amplifier configured to subtract the predetermined voltage from a voltage generated in the capacitor group in conjunction with the transfer of the charge, and the operational amplifier then configured to set, as an output voltage, a voltage obtained by amplifying the result of the subtraction;
- and converter configured to be connected to the operational amplifier, and the converter configured to convert the output voltage into a digital value of a predetermined number of bits including a redundancy bit;
- and
- a plurality of switch networks each of which connects a corresponding one of the plurality of the capacitor networks to any one of the sampling unit and the plurality of A/D converters in one-to-one correspondence,
- wherein the switch networks change the connections among the plurality of capacitor networks, the sampling unit and the plurality of A/D converters, at each predetermined time intervals, so that a pipeline operation is performed.
Dependencies are inferred from the claim text.