Precise integrated current mirrors

(Not Applicable) A high precision current control circuit (current mirror) is disclosed. As in prior current mirrors, a reference voltage is generated from the input reference current. An operational amplifier is placed between the reference diode and the bases of the controlled transistors to provi...

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Bibliographic Details
Main Authors Ragan, Lawrence Henry, Gehring, Mark Richard
Format Patent
LanguageEnglish
Published 21.05.2002
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Summary:(Not Applicable) A high precision current control circuit (current mirror) is disclosed. As in prior current mirrors, a reference voltage is generated from the input reference current. An operational amplifier is placed between the reference diode and the bases of the controlled transistors to provide precise reproduction of the reference voltage with ample current to drive many controlled current sources or current sources with high multiplication ratios from the reference current. As compared to prior emitter follower drivers, a lower voltage threshold of operation from an external proportional control results. Lower power supply voltage is supported, since one diode drop is removed from the reference current path.