Flash A/D converter

A flash A/D converter comprising:

• a plurality of master comparators for comparing a plurality of reference voltages and an input analog signal to absorb a current with a constant value from a non-inverted output or inverted output of each of said master comparators in accordance with a relation in magnitude between said reference voltage and said input analog signal;
• a plurality of slave comparators having inputs thereof selectively coupled to the non-inverted outputs or inverted outputs of said plurality of master comparators through a plurality of signal lines, said plurality of slave comparators outputting desired digital signals;
• a plurality of constant current sources coupled to said plurality of signal lines, respectively;
• and
• a plurality of load resistors having their first ends coupled to said plurality of signal lines respectively and their second ends opposite to the first ends,
• wherein a common DC bias voltage is applied to the second ends of said plurality of load resistors and wherein the constant current value of one of said plurality of constant current sources coupled to the signal line coupled to the input of the slave comparator of a lower bit side is set to a value larger than that of one of said plurality of constant current sources coupled to the signal line coupled to the input of the slave comparator of a higher bit side.