Feed-forward compensation for low-dropout voltage regulator
AssigneeAdvanced Micro Devices, Inc.
InventorsEmerson S. Fang, Alvin Leng Sun Loke
Life of this patent
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Abstract
A voltage regulator includes a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node, a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage, and a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage.
Claims21
A voltage regulator, comprising:
- a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node;
- a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage;
- and
- a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage.
A circuit, comprising:
- a voltage controlled oscillator operable to generate a clock signal;
- a phase detector operable to determine a phase difference between a data signal and the clock signal and control a frequency of the clock signal generated by the voltage controlled oscillator based on the phase difference;
- and
- a voltage regulator operable to receive a supply voltage and generate an output voltage for powering the voltage controlled oscillator, the voltage regulator comprising:
- a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node;
- a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage;
- and
- a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage.
A method, comprising:
- enabling a pass element of a voltage regulator, the pass element having a control input coupled to a control node and operable to generate an output voltage at an output node based on a supply voltage;
- receiving a reference voltage and the output voltage;
- generating a signal at the control node based on a difference between the reference voltage and the output voltage to control the pass element to generate the output voltage;
- and
- generating a bias current using a noise cancellation circuit having at least one variable resistor at the control node based on the supply voltage.
A computer readable storage device encoded with data that, when implemented in a manufacturing facility, adapts the manufacturing facility to create a voltage regulator, comprising:
- a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node;
- a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage;
- and
- a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage.
Dependencies are inferred from the claim text.