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    ELECTROSTATIC DISCHARGE PROTECTION FOR CLASS D POWER AMPLIFIERS
    4.
    发明公开
    ELECTROSTATIC DISCHARGE PROTECTION FOR CLASS D POWER AMPLIFIERS 审中-公开
    静电放电保护FOR CLASS D电源转换器

    公开(公告)号：EP2904640A1

    公开(公告)日：2015-08-12

    申请号：EP13780016.5

    申请日：2013-10-04

    申请人： Qualcomm Incorporated

    发明人： SRIVASTAVA, Ankit ,  WORLEY, Eugene Robert

    IPC分类号： H01L27/02 ,  H02H9/04

    CPC分类号： H01L27/0285 ,  H02H9/046

    摘要： Electrostatic discharge protection for Class D power amplifiers is disclosed. In an exemplary embodiment, an apparatus includes an amplifier having an output transistor coupled to an interface pad, a snapback supply clamp coupled across first and second supplies of the amplifier and configured to provide a clamp voltage across the first and second supplies during ESD event; and a trigger circuit coupled to the output transistor, the trigger circuit configured to detect the clamp voltage and to enable the output transistor to provide a discharge path from the interface pad to the second supply when the clamp voltage is detected.

    CHARGE PUMP SURGE CURRENT REDUCTION
    6.
    发明公开
    CHARGE PUMP SURGE CURRENT REDUCTION 审中-公开
    峰值功率降低系统泵

    公开(公告)号：EP2686945A2

    公开(公告)日：2014-01-22

    申请号：EP12713449.2

    申请日：2012-03-14

    申请人： Qualcomm Incorporated

    发明人： QUAN, Xiaohong ,  SRIVASTAVA, Ankit ,  MIAO, Guoqing

    IPC分类号： H02M3/07

    CPC分类号： H02M3/07 ,  H02M1/36 ,  H02M2001/0045 ,  H02M2003/071 ,  H02M2003/072

    摘要： Techniques for reducing surge current in charge pumps. In an exemplary embodiment, one or more switches coupling a terminal of a flying capacitor to a voltage supply are configured to have variable on-resistance. When the charge pump is configured to switch a gain mode from a lower gain to a higher gain, the one or more variable resistance switches are configured to have a decreasing resistance profile over time. In this manner, surge current drawn from the voltage supply at the outset of the gain switch may be limited, while the on-resistance during steady-state charging and discharging may be kept low. Similar techniques are provided to decrease the surge current from a bypass switch coupling the supply voltage to a positive output voltage of the charge pump.