Low Dropout Regulator with Feedforward Power Supply Noise Rejection Circuit
AssigneeApple Inc.
InventorsGokce Gurun, Sanjeev K. Maheshwari, Wenbo Liu
Life of this patent
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Abstract
A voltage regulator circuit included in a computer system may include a switch device coupled between an input power supply node and a regulated power supply node. The switch device may change a value of a supply current flowing from the input power supply node and the regulated power supply node to regulate a voltage level of the regulated power supply node. A noise cancelation current may be feed forward onto a control terminal of the switch device to cancel noise on the regulated power supply node resulting from noise present on the input power supply node.
Claims20
An apparatus, comprising:
- a switch device coupled between an input power supply node and a regulated power supply node, wherein the switch device is configured to change, using a voltage level of a control node, a value of a supply current flowing from the input power supply node to the regulated power supply node;
- and
- a control circuit configured to:
- generate a feedback signal using a voltage level of the regulated power supply node;
- perform a comparison of a voltage level of the feedback signal and reference voltage level;
- adjust, using results of the comparison, the voltage level of the control node;
- and
- inject a noise cancelation current into the control node, wherein a value of the noise cancelation current is based on noise present on the input power supply node.
A method, comprising:
- adjusting, by a switch device, a value of a supply current between an input power supply node and a regulated power supply node using a voltage level of a control signal coupled to a control terminal of the switch device;
- generating a feedback signal using a voltage level of the regulated power supply node;
- and
- adjusting the voltage level of the control signal using the feedback signal, a reference voltage level, and a noise cancelation current whose value is based on noise present on the input power supply node.
An apparatus, comprising:
- a load circuit coupled to a regulated power supply node;
- and
- a voltage regulator circuit configured to:
- adjust a value of a supply current between an input power supply node and the regulated power supply node using a voltage level of a control node coupled to a switch device that is coupled between the input power supply node and the regulated power supply node;
- generate a feedback signal using a voltage level of the regulated power supply node;
- and
- modify the voltage level of the control node using the feedback signal, a reference voltage level, and a noise cancelation current whose value is based on noise included on the input power supply node.
Dependencies are inferred from the claim text.