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    • 6. 发明申请
    • METHOD AND APPARATUS FOR DRAIN SWITCHING WITH REPLICATION LOOP FOR FAST LED TURN ON TIME
    • 用于快速LED启动循环的排水开关的方法和装置
    • WO2014004722A2
    • 2014-01-03
    • PCT/US2013/047980
    • 2013-06-26
    • QUALCOMM INCORPORATED
    • GUAN, HuaZEISEL, Eric B.LOU, Qi
    • H03K17/04206
    • A method and apparatus for current drain switching with a replica loop. The method comprises the steps of: matching a voltage across a current sense resistor with a voltage created by a reference current across a matched reference resistor; replicating an operating point of an output transistor using a scaled matched replica of the output transistor and the current sense resistor. The method then shifts a feedback voltage from the output sense resistor to the matched replica sensor and shifts the output of a gate from an output transistor to the replica transistor. A first switch is then actuated in order to preserve the gate charge of the output transistor. A second switch is actuated to sample and hold a drain voltage in the buffer in order to bias the drain of the replica transistor. The third switch is then activated to stop the output current.
    • 一种具有复制环路的电流漏极切换的方法和装置。 该方法包括以下步骤:将电流检测电阻器两端的电压与参考电流产生的电压匹配在匹配的参考电阻上; 使用输出晶体管和电流检测电阻器的缩放匹配的副本复制输出晶体管的工作点。 该方法然后将反馈电压从输出检测电阻器移动到匹配的复制传感器,并将栅极的输出从输出晶体管移位到复制晶体管。 然后启动第一开关以便保持输出晶体管的栅极电荷。 致动第二开关以对缓冲器中的漏极电压进行采样和保持,以便偏置复制晶体管的漏极。 然后激活第三个开关以停止输出电流。