Title: Constant current circuit
Application Number: 200610121891 Application Date: 2006.08.29
Publication Number: 1924751 Publication Date: 2007.03.07
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G05F3/26
Applicant(s) Name: Sanyo Electric Co. Address:
Inventor(s) Name:
Attorney & Agent: shaoya li lixiao shu
Abstract:
    In CMOS processing, there may be a case in which a resistance element, such as a poly-silicon resistance, or the like, may be formed which has negative temperature characteristics, that is, the characteristics opposite from the characteristics of a typical resistance element. In a constant current circuit using this resistance element, a constant current output less affected by the influence of varying temperature is obtained. To one of the paths of a current mirror circuit from which a constant current is extracted, a serial connection circuit comprising a transistor Q 1 for flowing a current I 1 having positive temperature characteristics, a resistance element R 1 and a bipolar transistor Q 6 is connected. Further, in parallel to this serial connection circuit, a temperature compensation circuit comprising a transistor Q 8 for flowing a current I 2 having negative temperature characteristics and a resistance element R 2 is connected. A constant current output based on the sum current I of the currents I 1 and I 2 is obtained. In this manner, an output less affected by the influence of varying temperature is obtained.
Time: 9
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