| 摘要 |
PROBLEM TO BE SOLVED: To reduce variation of a parasitic capacitance caused on a connection wiring when a plurality of resistors are series-connected in an interpolation circuit. SOLUTION: An A/D converter circuit includes a plurality of folding amplifiers for generating and outputting positive-phase signals having a different phase, respectively, and negative-phase signals thereof, the interpolation circuit for generating a plurality of interpolation signals of the same phase and reverse phase from an output of the folding amplifiers, a plurality of comparators for inputting the interpolation signal generated by this interpolation circuit, and an encoder circuit 6 for encoding the output from these comparators. The interpolation circuit divides the plurality of resistors to each predetermined number, juxtaposes a plurality of resistor strings in which the predetermined number of resistors are series-connected on a straight line, connects the resistors at one end of each resistor string with each other for every two strings, respectively, and connects the resistors at the other end of each resistor string with each other for every two strings in a different combination from the combination of the two strings, respectively, thereby connecting the plurality of resistors annularly. COPYRIGHT: (C)2008,JPO&INPIT
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