| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an analog-to-digital converter (ADC) having a sparkle suppression capability equivalent to that of a full bit Gray encoding method and preventing criss-crossing of interconnections and an increase in pipeline delay. Ž<P>SOLUTION: A flash type analog-to-digital converter includes: a first encoder 3<SB>-8</SB>for generating a different reference voltage Vref at intervals of predetermined voltage steps, comparing in parallel the reference voltage Vref with a voltage of an analog input signal Vin to detect a voltage level of the analog input signal, encoding a voltage level for most significant n bits of predetermined N bits and outputting a Gray code; second encoders 3<SB>-1</SB>to 3<SB>-7</SB>each for encoding and outputting a voltage level for the remaining least significant bits; a first output circuit 4 for converting the Gray code output from the first encoder into a binary code and generating most significant n bits ADB[5]-ADB[3]; and a second output circuit 5 for generating least significant bits ADB[2]-ADB[0] by using a digital signal ADB[3] generated from the first output circuit 4 and the output of the second encoder. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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