Current mirror circuit and reference voltage generating and light emitting element driving circuits using the same

A current mirror circuit including 2.times.m sets (m being a natural number not smaller than 2) of FET pairs each combining together two pieces of a plurality of n-FETs having identical characteristics such that respective sources and gates thereof are connected to each other in a crossing manner;

• m sets of the FET pairs constituting each of first and second groups of FET pair series;
• each of the n-FETs in said first group of FET pair series having a drain connected to a higher-potential side power supply;
• whereas, in said second group of FET pair series,
• a first n-FET of an i-th (1.ltoreq.i.ltoreq.m-1) set of FET pair having a drain connected to the source of a second n-FET of the i-th set of FET pair in said first group of FET pair series, the second n-FET thereof having a drain connected to the source of the first n-FET of an (i+1)-th set of FET pair in said first group of FET pair series,
• the first n-FET of an m-th set of FET pair having a drain connected to the source of the second n-FET of the m-th set of FET pair in said first group of FET pair series, the second n-FET thereof having a drain connected to the source of the first n-FET of the first set of FET pair in said first group of FET pair series, thus forming a circular path;
• wherein all of the m pieces of the first n-FETs in said second group of FET pair series have source output currents identical to each other, and all of the m pieces of said second n-FETs in said second group of FET pair series have source output currents identical to each other.