Analog switches and methods for controlling analog switches

    公开(公告)号:US09621156B2

    公开(公告)日:2017-04-11

    申请号:US14109249

    申请日:2013-12-17

    Inventor: David Aherne

    CPC classification number: H03K17/6872 H03K2217/0018

    Abstract: An analog switch may be maintained reliably in an off state. The switch comprises: a P-type first transistor having a source, a drain and a gate, a N-type second transistor having a source, a drain and a gate, and a switch control circuit to drive the gates of the first and second transistors. The drain of the first transistor and the source of the second transistor are connected at a first node, and the source of the first transistor and the drain of the second transistor are connected at a second node. When the voltage at the first or second nodes falls outside of a supply voltage range of the switch control circuit, the switch control circuit is operable, in response to a signal to make the switch high impedance, by adjusting the gate voltages of the first transistor and the second transistor.

    CHARGE INJECTION COMPENSATION CIRCUIT
    16.
    发明申请

    公开(公告)号:US20180159523A1

    公开(公告)日:2018-06-07

    申请号:US15370564

    申请日:2016-12-06

    CPC classification number: H03K17/165 H03K2217/0054

    Abstract: A charge injection compensation circuit compensates for charge injection by a field-effect transistor (FET) switch regardless of a supply voltage. The charge injection compensation circuit includes a main switch that injects charge into an electronic circuit when switched off, and a charge storage device that stores the injected charge until it can be dissipated to a dissipating node. Upon the main switch being controlled to switch off, a pulse generator circuit controls a charge storage switch to switch on to transfer the charge injected from the main switch to the charge storage device and then switch off. A dissipation circuit dissipates the charge from the charge storage device to a dissipating node.

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