Current mirror circuit and reference voltage generating and light emitting element driving circuits using the same
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United States of America Patent
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Mar 9, 1999
Grant Date -
N/A
app pub date -
Sep 3, 1997
filing date -
Sep 4, 1996
priority date (Note) -
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Abstract
A plurality of n-channel FETs in predetermined combinations are grouped two by two into pairs, and their respective gates and sources are connected to each other in a crossing manner, thus forming a first current mirror circuit connected to a higher-potential side power supply. A second current mirror circuit constituted by another plurality of n-channel FETs, diodes, and a variable resistor, which is connected to a lower-potential side power supply, is connected to the first current mirror circuit connected to the higher-potential side power supply, thereby forming a reference voltage generating circuit which generates a constant voltage. Further, three other pieces of n-channel FETs biased by this constant voltage, a diode, and the like constitute a light emitting element driving circuit for driving a light emitting element.
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