Duty cycle mode switching voltage regulator
First Claim
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1. A voltage regulator comprising:
- a first input operable to be coupled to a supply voltage;
a second input operable to be coupled to a reference voltage;
an output operable to provide an output voltage that is a substantially constant function of the reference voltage;
an output stage operable to provide a pulsed output voltage;
a filter, the filter having a first terminal coupled to the output stage and a second terminal coupled to an output load resistance; and
a feedback loop coupled between the output stage and an input of a comparator.
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Abstract
One disclosed method includes controlling an output voltage to track a reference voltage by using a feedback loop to monitor an output duty cycle and to maintain an output voltage that is substantially constant relative to the reference voltage.
9 Citations
28 Claims
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1. A voltage regulator comprising:
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a first input operable to be coupled to a supply voltage;
a second input operable to be coupled to a reference voltage;
an output operable to provide an output voltage that is a substantially constant function of the reference voltage;
an output stage operable to provide a pulsed output voltage;
a filter, the filter having a first terminal coupled to the output stage and a second terminal coupled to an output load resistance; and
a feedback loop coupled between the output stage and an input of a comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A voltage regulator operable to generate a first supply voltage from a second supply voltage, the voltage regulator including:
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a comparator having a first comparator input, a second comparator input, and a comparator output, the comparator being operable to amplify a voltage difference between the first comparator input and the second comparator input, wherein the first comparator input is configured to be coupled to a reference voltage, and the second comparator input is configured to be coupled to a feedback voltage;
an output stage, the output stage being configured to be coupled to the second supply voltage, the output stage having an input that is configured to be directly or indirectly driven by the comparator output, the output stage having an output stage output that is operable to provide a pulsed output voltage from which the feedback voltage can be derived;
a filter coupled between the output stage output and an output load resistance; and
a feedback loop, the feedback loop being coupled between the output stage output and the second comparator input. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
controlling an output voltage to track a reference voltage, including;
using a feedback loop to monitor an output duty cycle and to maintain an output voltage that is substantially constant relative to the reference voltage. - View Dependent Claims (18, 19, 20)
- 21. A voltage regulator operable to control an output voltage to track a reference voltage, the voltage regulator including a feedback loop operable to monitor an output duty cycle and to maintain the output voltage as a substantially constant function of the reference voltage.
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25. A system comprising:
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a circuit board;
an integrated circuit chip comprising;
a first circuit designed to operate using a first supply voltage;
a second circuit designed to operate using a second supply voltage;
a voltage regulator operable to generate the second supply voltage from the first supply voltage, the voltage regulator comprising;
a comparator having a first comparator input and a second comparator input, the comparator being operable to amplify a voltage difference between the first comparator input and the second comparator input, wherein the first comparator input is coupled to a reference voltage, and the second comparator input is coupled to a feedback voltage;
an output stage, the output stage being coupled to the first supply voltage, the output stage having an output stage output operable to supply a pulsed output voltage from which the feedback voltage can be derived;
a filter coupled between the output stage output and the second circuit; and
a feedback loop, the feedback loop being coupled between the output stage output and the second comparator input. - View Dependent Claims (26, 27, 28)
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Specification