Constant current source circuit with variable temperature compensation

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	Constant current source circuit with variable temperature compensation
其他题名	Constant current source circuit with variable temperature compensation
	DEMSKY, KEVIN PAUL; EWEN, JOHN FARLEY; PASCHAL, MATTHEW JAMES
	2001-07-24
专利权人	INTERNATIONAL BUSINESS MACHINES CORPORATION
公开日期	2001-07-24
授权国家	美国
专利类型	授权发明
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.
其他摘要	恒流源电路提供电流，补偿由温度变化引起的性能变化。该电路混合具有负温度系数的可变量的电流和具有正温度系数的电流。公开了该电路的模拟和数字实施例。在模拟实施例中，具有正温度系数的电流量被加到具有负温度系数的电流量，该负温度系数由输入到晶体管的可变控制电压和带隙参考电压之间的电压差确定。两个电流选择器中的每一个中的晶体管连接到可变控制电压，其中一个连接到地，另一个输出;每个电流选择器中的另一个晶体管连接到参考电压，并且一个晶体管再次接地而另一个晶体管接地输出的电流与连接到可变控制电压的第一电流选择器中的晶体管的输出混合。通过相对于带隙参考电压改变控制电压，可以实现连续范围的温度系数。该数字实施例具有数字 - 模拟转换器，其连接到具有正温度系数的电流的偏置电压，以及第二数字 - 模拟转换器，其连接到具有负温度系数的电流的第二偏置电压。到相应开关的数字输入信号确定每个数模转换器中的相应晶体管是否传导电流。两个数模转换器可以配置在集成互补单元电池的共同质心布置中。恒流源电路可用于驱动片外并联负载，例如VCSEL的。
申请日期	1998-12-22
专利号	US6265857
专利状态	失效
申请号	US09/218340
公开（公告）号	US6265857
IPC 分类号	G05F3/08 \| G05F3/24 \| G05F3/16 \| H03M1/06 \| H03M1/74
专利代理人	-
代理机构	TRUELSON, ROY W. OJANEN, KARUNA
文献类型	专利
条目标识符	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[P]. 2001-07-24.

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