Abstract: There is provided a determination device comprising a determination section configured to determine an area where a portable device is positioned, on a basis of wireless communication between a plurality of first wireless communication devices installed at different portions of a mobile object and a second wireless communication device installed in a portable device, in conformity with a designated communication standard, wherein the determination section determines the area where the portable device is positioned, by using different determination expressions depending on the respective first wireless communication devices, each of which has successfully calculated an RSSI with regard to a signal received from the second wireless communication device through wireless communication compliant with the designated communication standard and a determination target area.

Abstract: There is provided a determination device comprising a determination section configured to determine an area where a portable device is positioned, on a basis of wireless communication between a plurality of first wireless communication devices disposed at different portions in a target space where a plurality of areas is defined and a second wireless communication device installed in a portable device, in conformity with a designated communication standard, wherein the determination section determines the area where the portable device is positioned, by using different determination expressions depending on the respective first wireless communication devices, each of which has successfully calculated an RSSI with regard to a signal received from the second wireless communication device through wireless communication compliant with the designated communication standard and a determination target area.

Abstract: A determination device comprising a determination section configured to determine whether a portable device is positioned in a first area or a second area on a basis of results of ranging based on wireless communication between at least two first wireless communication devices and a second wireless communication device, the at least two first wireless communication devices being disposed with a boundary arrangement interposed therebetween, the boundary arrangement being arranged at a boundary between the first area and the second area, the second wireless communication device being installed in the portable device, wherein the determination section determines whether the portable device is positioned in the first area or the second area on a basis of a difference between ranging value calculated by first wireless communication device disposed in the first area and ranging value calculated by first wireless communication device disposed in the second area.

Abstract: A comparator circuit is provided, including an input current generation section configured to generate an input current based on an input voltage, a reference current generation section configured to generate a reference current based on a reference voltage, a first current-voltage conversion section configured to convert the input current to a comparison-target voltage, a second current-voltage conversion section configured to convert the reference current to a threshold voltage, and a comparison section configured to compare the comparison-target voltage against the threshold voltage. The input current generation section includes a first transistor having a gate and a drain that are connected together, and the input voltage is input to the drain of the first transistor via a resistor.

Abstract: An input circuit including an input transistor including a drain input with an input voltage, an input current generation circuit configured to generate an input current to flow in the input transistor, a resistor connected between a source of the input transistor and a first power source, and an output transistor including a gate connected to a connection point between the source of the input transistor and the resistor.

Abstract: A constant current circuit is provided including: a constant current generation circuit; a control transistor included in the constant current generation circuit and configured to flow with a constant current generated by the constant current generation circuit and with a start-up current at start-up; an output transistor having a gate voltage controlled by the control transistor and configured to generate an output current based on the constant current; and a bypass transistor having a gate with common connection to a gate of the control transistor and configured to cause the start-up current flowing in the control transistor to bypass after start-up.

Abstract: A constant voltage generation circuit is provided. The constant voltage generation circuit includes a differential pair including a first transistor having a gate input with a reference voltage and a second transistor having a gate input with a signal corresponding to an output voltage, an output transistor that has a gate connected to a connection point between a drain of one transistor out of the differential pair and a load of the one transistor and that is configured to output the output voltage, and a diode connected between the gate of the output transistor and a power source.