Detector

Abstract

Provided is a detector that can detect that a voltage is out of a guaranteed operation voltage even when a delay time of a logic element caused by a reduction in a power supply voltage varies due to an external factor. The detector comprises: a plurality of first detection circuits; a first detection rate calculation unit; a plurality of second detection circuits; a second detection rate calculation unit; and a comparison-and-determination unit. The present invention provides a detector, wherein each of the plurality of first detection circuits detects whether or not an input voltage is a value outside a guaranteed operation range for normal operation; the first detection rate calculation unit calculates first detection rates of which the number is the number of the detected first detection circuits; each of the plurality of second detection circuits detects whether or not a predetermined reference voltage is lower than a threshold voltage; the second detection rate calculation unit calculates second detection rates of which the number is the number of the detected second detection circuits; and the comparison-and-determination unit determines that a value of the input voltage is equal to or less than a value of the threshold voltage when the first detection rate and the second detection rate are substantially equal to each other.

Description

technical field [0001] The present technology relates to detectors, and more particularly, to a logic detector using digital detection circuits. Background technique [0002] In a semiconductor device (integrated circuit) in which a central processing unit (CPU), a digital signal processor (DSP), etc. are mounted, the power-supply droop during the operation of the logic circuit under consideration is used to determine the Guaranteed operating voltage. [0003] In recent years, in order to reduce power consumption in semiconductor devices (integrated circuits), it is necessary to minimize guaranteed operating voltages in semiconductor devices (integrated circuits). Therefore, in the case where the voltage supplied to the logic circuit is outside the guaranteed operating range, a circuit that detects the supply voltage outside the guaranteed operating range is required. [0004] Here, there is known a phenomenon called power droop in which a voltage input to a semiconductor ...

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Problems solved by technology

[0005] However, in the case of detecting power supply droop using an analog circuit, the response of the amplifier is poor, and in some cases, rapid power droop cannot be detected

On the other hand, if the response speed of the amplifier increases, power consumption (current consumption) may increase

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