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12. 发明授权

US4323854A Temperature compensated current source 失效
标题翻译：温度补偿电流源
公开(公告)号：US4323854A
公开(公告)日：1982-04-06
申请号：US116698
申请日：1980-01-30
申请人： Richard E. Hester
发明人： Richard E. Hester
IPC分类号： H03F1/30 , H03F3/45 , H03K3/26
CPC分类号： H03F1/302 , H03F3/45098 , H03F2203/45508 , Y10S323/907
摘要： A temperature compensated current source includes three successive source current paths to produce a controlled output current. Each current path has a different value of current flowing therein so that current fluctuations in one current path will tend to be isolated from the other current paths because of the difference in current flow. In the embodiment of the invention shown, a reference zener diode provides a reference voltage at the base of a first transistor to establish a first reference current as its emitter current. A second transistor uses the first current as the reference to establish a second current value which has a positive temperature coefficient. Third, fourth and fifth transistors use the second reference current to establish a third reference current value independent of the gain values of these transistors. In the embodiment of the invention described, the third reference current is used to establish a reference voltage stable with respect to variations in the power supply, transistor gain and resistivity fluctuations of the circuit but with increasing voltage as a function of temperature. This voltage variation is used in combination with a load to cancel the effect of the load variations with temperature by providing an increased source voltage as a function of temperature.
摘要翻译：温度补偿电流源包括三个连续的源电流路径，以产生受控的输出电流。每个电流路径具有在其中流动的电流的不同值，使得一个电流路径中的电流波动将倾向于与其他电流路径隔离，因为电流的差异。在所示的本发明的实施例中，参考齐纳二极管在第一晶体管的基极处提供参考电压，以建立第一参考电流作为其发射极电流。第二晶体管使用第一电流作为基准来建立具有正温度系数的第二电流值。第三，第四和第五晶体管使用第二参考电流来建立独立于这些晶体管的增益值的第三参考电流值。在所描述的本发明的实施例中，第三参考电流用于建立相对于电源的变化，电路的晶体管增益和电阻率波动的稳定的参考电压，但是随着电压随温度升高而增加。该电压变化与负载组合使用，通过提供作为温度的函数的增加的源电压来消除负载随温度变化的影响。

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