Offset-voltage compensation for accurate current-source circuit

被引：0
|
作者：
Jang, K. [1 ]
Lee, S. [1 ]
Lee, J. [2 ]
Choi, J. [1 ]
机构：
[1] Univ Seoul, Seoul, South Korea
[2] Samsung Electromech, Gyeonggi Do, South Korea
来源：
ELECTRONICS LETTERS | 2012年 / 48卷 / 15期
关键词：
DRIVER;
D O I：
10.1049/el.2012.0739
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The offset-voltage compensation technique is proposed for an accurate current-source circuit. This current source is made of a transistor, a resistor, and operational amplifier feedback in order to achieve a high output resistance as well as high accuracy of a generated current signal. Discrepancy from the ideal value mainly results from the offset voltage of the operational amplifier. The transconductance amplifier is utilised with a feedback loop that is controlled by the switched-capacitor integrator. The proposed technique is incorporated in the light-emitting diode driver circuit applications and successfully verified with hardware measurement.
引用
收藏
页码：913 / 914
页数：2
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