Dual input single output regulator for an inertial sensor
First Claim
1. A dual input single output regulator, comprising:
- a first power supply node configured to have a first power supply signal;
a second power supply node configured to have a second power supply signal;
a first comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply nodes, respectively, to receive the first and second power supply signals, respectively, and the output terminal being configured to provide a first compared signal indicative of a result of a comparison between the first and second power supply signals, the first comparator being configured to be controlled by an external control signal, to force the first compared signal to a predefined logic value;
a first switch configured to electrically couple the first power supply node to an intermediate node, the first switch having a first control terminal;
a second switch configured to electrically couple the second power supply node to the intermediate node, the second switch having a second control terminal;
a second comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply nodes, respectively, to receive the first and second power supply signal, respectively, and the output terminal being configured to provide a second compared signal indicative of a result of a comparison between the first and the second power supply signal, the second comparator being configured to be controlled by the external control signal to force the second compared signal to the predefined logic value; and
a control logic circuit, having a first input terminal coupled to the output terminal of the first comparator, a second input terminal coupled to the output terminal of the second comparator, a first output terminal coupled to the first control terminal of the first switch, and a second output terminal coupled to the second control terminal of the second switch, the control logic circuit being configured to receive the first compared signal and to operate the first and second control terminals of the first and the second switches, respectively, to control the first and second switch in first and second operating conditions, respectively, based on the first or second compared signal, wherein;
the control logic circuit is configured to place, during the first operating condition, the first switch in a closed state and the second switch in an open state and, during the second operating condition, to place the second switch in the closed state and the first switch in the open state,the first switch is configured, when in the closed state, to bias the intermediate node with a first intermediate power supply signal correlated to the first power supply signal, andthe second switch is configured, when in the closed state, to bias the intermediate node with a second intermediate power supply signal correlated to the second power supply signal; and
a low-dropout regulator having an input terminal coupled to said intermediate node and configured to receive the intermediate power supply signals, and an output terminal configured to provide a regulated power supply signal based on said intermediate power supply signals.
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Accused Products
Abstract
A dual input single output (DISO) regulator, includes a comparator configured to receive a first and second power supply signal and to provide a first compared signal; a first switch configured to couple the first power supply source to an intermediate node, and a second switch configured to couple the second power supply source to the intermediate node; a control logic circuit, coupled to the first comparator, to the first switch, and to the second switch, and configured to receive the compared signal to control the first and the second switch in a first and second operating condition based on the compared signal. The intermediate node being biased by an intermediate power supply signal correlated to the first or second power supply signal. The DISO regulator includes a low-dropout regulator, configured to provide a regulated power supply signal based on the intermediate power supply signal.
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Citations
29 Claims
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1. A dual input single output regulator, comprising:
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a first power supply node configured to have a first power supply signal; a second power supply node configured to have a second power supply signal; a first comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply nodes, respectively, to receive the first and second power supply signals, respectively, and the output terminal being configured to provide a first compared signal indicative of a result of a comparison between the first and second power supply signals, the first comparator being configured to be controlled by an external control signal, to force the first compared signal to a predefined logic value; a first switch configured to electrically couple the first power supply node to an intermediate node, the first switch having a first control terminal; a second switch configured to electrically couple the second power supply node to the intermediate node, the second switch having a second control terminal; a second comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply nodes, respectively, to receive the first and second power supply signal, respectively, and the output terminal being configured to provide a second compared signal indicative of a result of a comparison between the first and the second power supply signal, the second comparator being configured to be controlled by the external control signal to force the second compared signal to the predefined logic value; and a control logic circuit, having a first input terminal coupled to the output terminal of the first comparator, a second input terminal coupled to the output terminal of the second comparator, a first output terminal coupled to the first control terminal of the first switch, and a second output terminal coupled to the second control terminal of the second switch, the control logic circuit being configured to receive the first compared signal and to operate the first and second control terminals of the first and the second switches, respectively, to control the first and second switch in first and second operating conditions, respectively, based on the first or second compared signal, wherein; the control logic circuit is configured to place, during the first operating condition, the first switch in a closed state and the second switch in an open state and, during the second operating condition, to place the second switch in the closed state and the first switch in the open state, the first switch is configured, when in the closed state, to bias the intermediate node with a first intermediate power supply signal correlated to the first power supply signal, and the second switch is configured, when in the closed state, to bias the intermediate node with a second intermediate power supply signal correlated to the second power supply signal; and a low-dropout regulator having an input terminal coupled to said intermediate node and configured to receive the intermediate power supply signals, and an output terminal configured to provide a regulated power supply signal based on said intermediate power supply signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A portable device, comprising:
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an inertial sensor having an input power supply pin; a first power source configured to generate a first power supply signal; a second power source configured to generate a second power supply signal; and a dual input single output regulator, including; a first comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply source, respectively, to receive the first and second power supply signal, and the output terminal being configured to provide a first compared signal indicative of a result of a comparison between the first and the second power supply signal, the first comparator being configured to be controlled by an external power down signal to force the first compared signal to have a predefined logic value; an intermediate node; a first switch configured to electrically couple the first power supply source to the intermediate node, the first switch having a first control terminal; a second switch configured to electrically couple the second power supply source to the intermediate node, the second switch having a second control terminal; a second comparator, having first and second input terminals and an output terminal, the first and second input terminals being configured to be electrically coupled to the first and second power supply source, respectively, to receive the first and second power supply signal, respectively, and the output terminal being configured to provide a second compared signal indicative of a result of a comparison between the first and the second power supply signal, the second comparator being configured to be controlled by the external power down signal to force the second compared signal to have the predefined logic value; a control logic circuit, having a first input terminal coupled to the output terminal of the first comparator, a second input terminal coupled to the output terminal of the second comparator, a first output terminal coupled to the control terminal of the first switch, and a second output terminal coupled to the control terminal of the second switch, the control logic circuit being configured to receive the first compared signal and to operate the control terminals of the first and the second switch to control the first and the second switch in first and second operating conditions, respectively, based on the first or second compared signal, wherein; the control logic is configured to place during the first operating condition, the first switch in a closed state and the second switch in an open state, and during the second operating condition configured to place the second switch in the closed state and the first switch in the open state, and the first switch is configured, when in the closed state, to bias the intermediate node with a first intermediate power supply signal correlated to the first power supply signal, and the second switch is configured, when in the closed state, to bias the intermediate node with a second intermediate power supply signal correlated to the second power supply signal; and a low-dropout regulator, having an input terminal coupled to said intermediate node to receive the intermediate power supply signal, and an output terminal configured to provide a regulated power supply signal based on said intermediate power supply signal, the output terminal of the low-dropout regulator being electrically coupled to the input power supply pin of the inertial sensor to supply the inertial sensor with a regulated voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification