High PSRR, fast settle time voltage regulator
First Claim
1. A voltage regulator comprising:
- a reservoir capacitance adapted to store charge corresponding to a regulated output voltage, wherein the charge stored by the reservoir capacitance is controlled by a first current;
first circuitry adapted to provide a second current based on the charge stored by the reservoir capacitance;
second circuitry adapted to receive the second current and generate a third current that is inversely related to the second current; and
a current mirror adapted to provide a fourth current based on the third current and a current mirror gain ratio;
the first circuitry further adapted to provide the first current based on the fourth current such that the charge stored by the reservoir capacitance increases when the fourth current increases.
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Accused Products
Abstract
A voltage regulator including a high-speed feedback loop operating to provide rapid settling time and a large Power Supply Rejection Ratio (PSRR). The high-speed feedback loop includes a reservoir capacitor that stores charge based on a charging current. The charge stored by the reservoir capacitor corresponds to a regulated voltage provided by the voltage regulator. When charge is drawn from the reservoir capacitor by a load, a dip occurs in the regulated output voltage. The high-speed feedback loop operates to restore the charge to the reservoir capacitor, thereby restoring the regulated voltage to its desired value. More specifically, when charge is drawn from the reservoir capacitor, the high-speed feedback loop operates to increase the first current, thereby restoring charge to the reservoir capacitor.
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Citations
52 Claims
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1. A voltage regulator comprising:
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a reservoir capacitance adapted to store charge corresponding to a regulated output voltage, wherein the charge stored by the reservoir capacitance is controlled by a first current; first circuitry adapted to provide a second current based on the charge stored by the reservoir capacitance; second circuitry adapted to receive the second current and generate a third current that is inversely related to the second current; and a current mirror adapted to provide a fourth current based on the third current and a current mirror gain ratio; the first circuitry further adapted to provide the first current based on the fourth current such that the charge stored by the reservoir capacitance increases when the fourth current increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for regulating an output voltage of a voltage regulator comprising:
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storing charge in a reservoir capacitance corresponding to a regulated output voltage, wherein the charge stored is controlled by a first current; providing a second current based on the charge stored by the reservoir capacitance; generating a third current that is inversely related to the second current; providing a fourth current based on the third current and a gain ratio; and providing the first current based on the fourth current such that the charge stored by the reservoir capacitance increases when the fourth current increases. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A system comprising:
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a voltage regulator comprising a reservoir capacitance and adapted to control charge stored by the reservoir capacitance such that the charge corresponds to a regulated output voltage; a reconstruction filter adapted to receive a digital signal from a data interface, sample the regulated output voltage based on the digital signal during a sampling phase of the reconstruction filter to generate a sampling signal, and provide an output signal based on the sampling signal; first charge compensation circuitry adapted to supply charge to the reservoir capacitance during the sampling phase of the reconstruction filter; and second charge compensation circuitry adapted to supply charge to the reservoir capacitance when the digital signal transitions between a first logic state and a second logic state. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification