| 摘要 |
PROBLEM TO BE SOLVED: To reduce a circuit scale and power consumption in a flash type A/D converter. SOLUTION: A plurality of transistors N<SB>0</SB>to N<SB>n</SB>having respectively different threshold voltages are arranged in parallel, an analog input signal is supplied to respective gates of the plurality of transistors N<SB>0</SB>to N<SB>n</SB>and output signals from respective transistors N<SB>0</SB>to N<SB>n</SB>are encoded to obtain a digital output signal, so that as compared with a conventional case that comparators each of which is composed of at least two transistors are connected in parallel, the number of transistors to be used can be reduced to a half and the necessity of a reference voltage generation circuit can be eliminated. COPYRIGHT: (C)2008,JPO&INPIT
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