Analog-to-digital converter
AssigneeSanyo Electric Co., Ltd.
InventorShigeto Kobayashi
Life of this patent
Estimating the term…
Abstract
An A-D converter includes an A-D converter circuit, a D-A converter circuit, a subtraction circuit, a second amplifier circuit, a reference voltage control circuit, a timing control circuit 18, an amplifier control circuit 19, and an output circuit. The reference voltage control circuit controls the range of reference voltage in the A-D converter according to a step or stage of conversion in the A-D converter. In particular, the reference voltage control circuit performs a control so that the range of reference voltage in the A-D converter circuit at the time of conversion in the third step is larger than that in the first and the second step.
Claims12
An analog-to-digital converter, which converts an input analog signal to a digital value of a predetermined number of bits as a result of a plurality of conversions, the analog-to-digital converter comprising:
- a conversion unit which converts the input analog signal to a digital value of less than the predetermined number of bits;
- and
- a control unit which controls conversion accuracy of said conversion unit,
- wherein said conversion unit is put to a common use in a plurality n of conversions that include a conversion to the least significant bit, and
- in a case of n=2, said control unit controls a conversion accuracy of said conversion unit in a manner such that the conversion accuracy of said conversion unit at the time of converting to the least significant bit is set higher than the conversion accuracy of said conversion unit prior to the converting to the least significant bit and, in a case of n≧3, said control unit controls a conversion accuracy of said conversion unit in a manner such that the conversion accuracy of said conversion unit at the time of converting to the least significant bit is set higher than the conversion accuracy of any one of conversions by said conversion unit prior to the converting to the least significant bit.
An analog-to-digital converter, which converts an input analog signal to a digital value of a predetermined number of bits as a result of a plurality of conversions through m stages connected in series, the analog-to-digital converter characterized in that each of the stages includes a conversion unit which converts the input analog signal to a digital value of less than the predetermined number of bits, and
- in a case of m=2, the conversion accuracy of a conversion unit included in a subsequent stage among the m stages is set higher than the conversion accuracy of a conversion unit included in a stage prior to the subsequent stage and, in a case of m≧3, the conversion accuracy of a conversion unit included in a last stage among the m stages is set higher than the conversion accuracy of a conversion unit included in any one of stages prior to the last stage.
Dependencies are inferred from the claim text.