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	Constant current source circuit with variable temperature compensation
	DEMSKY, KEVIN PAUL; EWEN, JOHN FARLEY; PASCHAL, MATTHEW JAMES
	2001-07-24
著作权人	INTERNATIONAL BUSINESS MACHINES CORPORATION
专利号	US6265857
国家	美国
文献子类	授权发明
其他题名	Constant current source circuit with variable temperature compensation
英文摘要	The constant current source circuit provides current that compensates for changes in performance resulting from changes of temperature. The circuit mixes variable amounts of current having a negative temperature coefficient with current having a positive temperature coefficient. Analog and digital embodiments of the circuit are disclosed. In the analog embodiment, the amount of current having a positive temperature coefficient is added to an amount of current having a negative temperature coefficient as determined by the voltage difference between a variable control voltage input to transistors and a bandgap reference voltage. A transistor in each of two current selectors is connected to the variable control voltage, one of which is connected to ground and the other of which is output; and another transistor in each current selector is connected to the reference voltage, and again one transistor is grounded and the other is output whose current is mixed with the output from the transistor in the first current selector connected to the variable control voltage. A continuous range of temperature coefficients are realizable by varying the control voltage with respect to the bandgap reference voltage. The digital embodiment has a digital-to-analog converter connected to a bias voltage from the current having a positive temperature coefficient and a second digital-to-analog converter connected to a second bias voltage from the current having a negative temperature coefficient. A digital input signal to a corresponding switch determines if its respective transistor in each of the digital-to-analog converters conduct current. The two digital-to-analog converters may be configured in a common centroid arrangement of integrated complementary unit cells. The constant current source circuit can be used to drive off-chip parallel loads such as VCSELs.
公开日期	2001-07-24
申请日期	1998-12-22
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/48562]
专题	半导体激光器专利数据库
作者单位	INTERNATIONAL BUSINESS MACHINES CORPORATION
推荐引用方式 GB/T 7714	DEMSKY, KEVIN PAUL,EWEN, JOHN FARLEY,PASCHAL, MATTHEW JAMES. Constant current source circuit with variable temperature compensation. US6265857. 2001-07-24.

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