Invention Grant
US08368577B2 A/D converter 有权
A / D转换器

A/D converter
Abstract:
An A/D converter includes a capacitive DAC configured to perform conversion of high-order bits by receiving a differential signal, a resistive DAC configured to perform conversion of low-order bits, a resistive correction DAC configured to operate to correct the capacitive DAC, and a comparator. The capacitive DAC includes a positive-side capacitive DAC and a negative-side capacitive DAC operating in a complementary fashion, and the comparator, which includes a plurality of differential circuits, is configured to compare output potentials of the positive-side capacitive DAC and the negative-side capacitive DAC. The positive-side capacitive DAC and the negative-side capacitive DAC include first capacitive elements each formed from interconnect layers excluding an uppermost interconnect layer, and the comparator includes second capacitive elements each provided between adjacent ones of the differential circuits and formed from interconnect layers including the uppermost interconnect layer.
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