| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a current reference circuit which occupies a small area on a semiconductor wafer, requires less power consumption and has low supply voltage dependency. <P>SOLUTION: The current reference circuit having low temperature dependency is disclosed. The current reference circuit includes a proportional-to-absolute temperature current generator, a band-gap reference circuit and a current replication circuit. The proportional-to-absolute temperature current generator generates a proportional-to-absolute temperature current IPTAT. The band-gap reference circuit generates a reference voltage based on the proportional-to-absolute temperature current and generates a second current IPTC having a positive (+) temperature coefficient by canceling a first current IZTC having a zero temperature coefficient with the proportional-to-absolute temperature current. The current replication circuit replicates the first current IZTC based on the proportional-to-absolute temperature current and the second current IPTC. Then, the current reference circuit occupies a small area on the wafer, requires less power consumption and has low supply voltage dependency. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
