Feed-forward compensation for low-dropout voltage regulator
First Claim
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1. 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, wherein the noise cancellation circuit comprises a feed-forward amplifier coupled to the control node and operable to receive a supply voltage and the output voltage and inject a feed-forward current at the control node based on a difference between the supply voltage and the output voltage.
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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.
32 Citations
19 Claims
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1. A voltage regulator, comprising:
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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, wherein the noise cancellation circuit comprises a feed-forward amplifier coupled to the control node and operable to receive a supply voltage and the output voltage and inject a feed-forward current at the control node based on a difference between the supply voltage and the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit, comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method, comprising:
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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. - View Dependent Claims (15, 16, 17, 18)
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19. 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:
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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; 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 voltage controlled oscillator operable to receive power form the voltage regulator and generate a clock signal; and 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.
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Specification