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High power supply rejection linear low-dropout regulator for a wide range of capacitance loads
High power supply rejection linear low-dropout regulator for a wide range of capacitance loads
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机译:高电源抑制线性低压降稳压器,适用于各种电容负载
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摘要
A method to maintain stability of a low drop-out linear voltage regulator (LDO) includes sensing, by a voltage controlled variable resistor, a node voltage in a feedback network of the LDO linear voltage regulator, wherein the feedback network includes an error amplifier configured to regulate an output voltage level of the LDO based on a reference voltage, wherein the node voltage has a dependency on a resistive load current of the LDO, and adjusting, by the voltage controlled variable resistor and based on the sensed node voltage, a resistance value of a RC network in the feedback network, wherein the adaptive RC network produces an adaptive zero in a transfer function of the feedback network, wherein the adaptive zero reduces phase margin degradation due to an output non-dominant pole in the transfer function, and wherein a frequency of the adaptive zero is inversely proportional to the resistance value.
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