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US 11,892,862 B2Granted
Power supply circuit having voltage switching function
AssigneeMicron Technology, Inc.
InventorTatsuya Matano
Life of this patent
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Abstract
Disclosed herein is an apparatus that includes a first reference voltage generator configured to generate a first voltage, a second reference voltage generator configured to generate a second voltage, a detection circuit configured to compare the first voltage with the second voltage to generate a selection signal, and a selection circuit configured to select one of the first and second voltages responsive to the selection signal. The detection circuit is configured to have a hysteresis property in changing a state of the selection signal.
Claims19
An apparatus comprising:
- a first reference voltage generator configured to generate a first voltage;
- a second reference voltage generator configured to generate a second voltage;
- a detection circuit configured to compare the first voltage with the second voltage to generate a selection signal;
- and
- a selection circuit configured to select one of the first and second voltages responsive to the selection signal,
- wherein the detection circuit is configured to have a hysteresis property in changing a state of the selection signal,
- wherein the detection circuit includes a current mirror circuit having an input current path flowing an input current controlled by one of the first and second voltages and an output current path flowing an output current controlled by other of the first and second voltages,
- wherein the current mirror circuit further includes a first additional current path coupled in parallel with one of the input current path and the output current path, and
- wherein the first additional current path is configured to be enabled responsive to the selection signal.
6 more elements
An apparatus comprising:
- a first reference voltage generator configured to generate a first voltage;
- a second reference voltage generator configured to generate a second voltage;
- a detection circuit configured to compare the first voltage with the second voltage to generate a selection signal;
- and
- a selection circuit configured to select the first voltage when the selection signal is in a first state and select the second voltage when the selection signal is in a second state,
- wherein at least one of the first and second voltages has a temperature dependency,
- wherein the detection circuit is configured to change the selection signal from the first state to the second state at a first temperature when increasing temperature and change the selection signal from the second state to the first state at a second temperature lower than the first temperature when decreasing temperature,
- wherein the detection circuit includes a current mirror circuit having an input current path flowing an input current controlled by one of the first and second voltages and an output current path flowing an output current controlled by other of the first and second voltages,
- wherein the current mirror circuit further includes a first additional current path coupled in parallel with one of the input current path and the output current path, and
- wherein the first additional current path is configured to be enabled responsive to the selection signal.
7 more elements
An apparatus comprising:
- a current mirror circuit having an input current path and an output current path;
- a first transistor coupled in series with the input current path and controlled by a first reference voltage;
- a second transistor coupled in series with the output current path and controlled by a second reference voltage;
- a first additional current path coupled in parallel with one of the first and second transistors;
- and
- an output circuit coupled to the output current path to generate a first selection signal,
- wherein the first additional current path includes a third-transistor controlled by one of the first and second reference voltages and a fourth transistor coupled in series with the third transistor, and
- wherein the fourth transistor is configured to be activated responsive to the first selection signal.
5 more elements
Dependencies are inferred from the claim text.