Compensated low dropout with high power supply rejection ratio and short circuit protection
AssigneeQUALCOMM Incorporated
InventorsSoheil GOLARA, Babak VAKILI-AMINI
Life of this patent
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Abstract
Disclosed is a low dropout (LDO) voltage regulator that includes a differential amplifier configured to amplify a differential between a reference voltage and a regulated output voltage, a pass transistor coupled to the differential amplifier and driven by an output of the differential amplifier, a compensation capacitor coupled to an output node of the differential amplifier, and an auxiliary amplifier, wherein an output node of the auxiliary amplifier is coupled to the compensation capacitor, and wherein an input node of the auxiliary amplifier is coupled to the pass transistor.
Claims30
A low dropout (LDO) voltage regulator, comprising:
- a differential amplifier configured to amplify a differential between a reference voltage and a regulated output voltage;
- a pass transistor coupled to the differential amplifier and driven by an output of the differential amplifier;
- a compensation capacitor coupled to an output node of the differential amplifier;
- and
- an auxiliary amplifier, wherein an output node of the auxiliary amplifier is coupled to the compensation capacitor, and wherein an input node of the auxiliary amplifier is coupled to the pass transistor.
A method for compensating a low dropout (LDO) voltage regulator, comprising:
- amplifying, by a differential amplifier, a differential between a reference voltage and a regulated output voltage;
- receiving, at a pass transistor coupled to the differential amplifier, an output of the differential amplifier;
- receiving, at a compensation capacitor, an output signal from an auxiliary amplifier, wherein the compensation capacitor is coupled to an output node of the differential amplifier, wherein an output node of the auxiliary amplifier is coupled to the compensation capacitor, and wherein an input node of the auxiliary amplifier is coupled to the pass transistor.
An apparatus for compensating a low dropout (LDO) voltage regulator, comprising:
- a differential amplifier configured to amplify a differential between a reference voltage and a regulated output voltage;
- a pass transistor coupled to the differential amplifier and driven by an output of the differential amplifier;
- a compensation means coupled to an output node of the differential amplifier;
- and
- an auxiliary amplification means, wherein an output node of the auxiliary amplification means is coupled to the compensation means, and wherein an input node of the auxiliary amplification means is coupled to the pass transistor.
A non-transitory computer-readable medium for compensating a low dropout (LDO) voltage regulator, comprising:
- at least one instruction to amplify, by a differential amplifier, a differential between a reference voltage and a regulated output voltage;
- at least one instruction to receive, at a pass transistor coupled to the differential amplifier, an output of the differential amplifier;
- at least one instruction to receive, at a compensation capacitor, an output signal from an auxiliary amplifier, wherein the compensation capacitor is coupled to an output node of the differential amplifier, wherein an output node of the auxiliary amplifier is coupled to the compensation capacitor, and wherein an input node of the auxiliary amplifier is coupled to the pass transistor.
Dependencies are inferred from the claim text.