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公开(公告)号：US11789478B2
公开(公告)日：2023-10-17
申请号：US17652065
申请日：2022-02-22
发明人： Zhicheng Deng , Yida Duan
摘要： Power supply noise reduction methods and low drop out (LDO) voltage regulators with capacitively coupled supply noise-reducing components are disclosed. One illustrative voltage regulator includes: a pass transistor having an n-type conduction channel that couples a supply voltage to an output node; an operational amplifier that derives a control signal for the pass transistor from a difference between a reference voltage and a scaled or unscaled voltage of the output node, the control signal being supplied to a gate or base of the pass transistor; a buffer that derives a ripple cancellation signal from the supply voltage; and a coupling capacitor that couples the buffer to the base or gate of the pass transistor to impose the ripple cancellation signal on the control signal.
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