Reference current generating circuit

A reference current generating circuit comprising:

• a first standard current generating circuit to generate a first standard current;
• a second standard current generating circuit to generate a second standard current by operating for a part of an operation period of the first standard current generating circuit;
• a first trimming circuit to generate a first reference current by trimming the value of the first standard current;
• a second trimming circuit to generate a second reference current by trimming the value of the second standard current;
• a comparison circuit to compare the value of the first reference current with the value of the second reference current;
• a trimming controller to control the trimming of the first trimming circuit so that the value of the first reference current approaches the value of the second reference current;
• a sense circuit to compare the first reference current with a cell current read from a memory cell;
• an error correction circuit to correct error data read from the memory cell;
• an error frequency determiner to determine the error frequency based on the corrected result by the error correction circuit;
• and
• a power supply controller to control power supply to the second standard current generating circuit based on the decision by the error frequency determiner.