Power detection circuit
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsChia-Chen Kuo, Chiting Cheng, Wei-jer Hsieh, Yangsyu Lin
Life of this patent
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Abstract
A power detection circuit is provided. The power detection circuit includes a comparator circuit operative to generate an output signal in response to an input signal. The output signal is configured to change from a first value to a second value in response to the input signal attaining a first threshold value. The output signal is configured to change from the second value to the first value in response to the input signal subsequently attaining a second threshold value. A current limiting circuit is connected to the comparator circuit and operative to limit a leakage current of the comparator circuit.
Claims20
A power detection circuit comprising:
- a comparator circuit operative to generate an output signal in response to an input signal, wherein the output signal is configured to change from a first value to a second value in response to the input signal attaining a first threshold value, and wherein the output signal is configured to change from the second value to the first value in response to the input signal subsequently attaining a second threshold value, wherein the second value is different than the first value, and wherein the second threshold value is different than the first threshold value;
- a current limiting circuit connected to the comparator circuit, wherein the current limiting circuit is operative to limit a leakage current of the comparator circuit;
- and
- a feedback circuit connected to the comparator circuit, wherein the feedback circuit is operative to control the first threshold value and the second threshold value.
A device comprising a power detection circuit, wherein the power detection circuit comprises:
- a comparator circuit operative to generate an output signal in response to an input signal, wherein the comparator circuit being operative to generate the output signal comprises the comparator circuit being operative to:
- generate the output signal comprising a first logic value in response to the input signal attaining a first threshold value, and
- generate the output signal comprising a second logic value when the input signal subsequently attains a second threshold value, the second logic value being different than the first logic value, wherein the second threshold value is different than the first threshold value;
- a current limiting circuit connected to the comparator circuit and operative to limit a leakage current of the comparator circuit;
- and
- a feedback circuit connected to the comparator circuit and operative to control the first predetermined threshold and the second predetermined threshold.
A method of detecting power in a circuit, the method comprising:
- receiving an input signal at a comparator circuit;
- comparing, by the comparator circuit, the input signal with a first threshold value;
- providing, by the comparator circuit, an output signal based on comparing the input signal with the first threshold value, wherein providing the output signal based on comparing the input signal with the first threshold value comprises providing the output signal comprising a first logic value in response to the input signal attaining the first threshold value;
- comparing, by the comparator circuit, the input signal with a second threshold value subsequent to attaining the first threshold value;
- providing, by the comparator circuit, the output signal comprising a second value in response to the input signal attaining the second threshold value subsequent to attaining the first threshold value;
- controlling the first threshold value and the second threshold value through a feedback circuit, wherein the feedback circuit is connected to the comparator circuit;
- and
- limiting a leakage current of the comparator circuit through a current limiting circuit, wherein the current limiting circuit is connected in parallel to the feedback circuit.
Dependencies are inferred from the claim text.