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    • 4. 发明申请
    • AUTO-ZEROED AMPLIFIER WITH LOW INPUT LEAKAGE
    • 具有低输入泄漏功能的自动调零放大器
    • WO2013138546A1
    • 2013-09-19
    • PCT/US2013/031151
    • 2013-03-14
    • TEXAS INSTRUMENTS INCORPORATEDTEXAS INSTRUMENTS JAPAN LIMITED
    • IVANOV, Vadim, ValerievichLUM-SHUE-CHAN, Brian, PhilipKADIRVEL, Karthik
    • H03F3/45H03F3/70
    • H03F3/45475H03F3/45977H03F2203/45461H03F2203/45551
    • An apparatus comprises an amplifier (340) having an inverting input and a non-inverting input; a capacitor coupled (350) to the inverting input of the amplifier; an input voltage conveyance control circuit (309), having a first switch (310) and a second switch (315), the first switch coupled to the capacitor, and the second switch coupled to the non-inverting input of the amplifier; a reference voltage conveyance control circuit (318) having a third switch (333) and a fourth switch (335), wherein a shared node (331) is coupled between the third switch and the fourth switch, the fourth switch coupled to the non-inverting input of the amplifier; a fifth switch (370) coupled to an output of the amplifier; a leakage control circuit (399) having a sixth switch (395) and a seventh switch (397), the sixth switch coupled between the inverting amplifier input and the fifth switch, the seventh switch coupled to the sixth switch and the capacitor; and a first resistor, a feedback resistor (360), coupled from the output of the amplifier to the first switch.
    • 一种装置包括具有反相输入和非反相输入的放大器(340) 电容器(350)耦合到放大器的反相输入端; 具有第一开关(310)和第二开关(315)的输入电压输送控制电路(309),所述第一开关耦合到所述电容器,所述第二开关耦合到所述放大器的非反相输入端; 具有第三开关(333)和第四开关(335)的参考电压输送控制电路(318),其中共享节点(331)耦合在第三开关和第四开关之间,第四开关耦合到非开关 放大器的反相输入; 耦合到所述放大器的输出的第五开关(370); 具有第六开关(395)和第七开关(397)的泄漏控制电路(399),所述第六开关耦合在所述反相放大器输入和所述第五开关之间,所述第七开关耦合到所述第六开关和所述电容器; 以及从放大器的输出端与第一开关耦合的第一电阻器,反馈电阻器(360)。