Abstract: An ANC system includes an AD converter which performs AD conversion on an external noise signal, an ANC signal generator which generates an ANC signal for canceling a noise component arriving at the ears of a user based on an output signal of the AD converter, and a level detector which detects a level of the output signal and causes the ANC signal generator to power down in response to the level. The level detector measures a time for which the level is equal to or less than a predetermined first threshold value, causes the ANC signal generator or a portion of blocks of the AD converter to power down after the measured time exceeds a predetermined value, and causes the ANC signal generator or a portion of blocks of the AD converter to return from the power down when the level exceeds a predetermined second threshold value.

Abstract: There is provided a successive-approximation type AD converter and a pipeline type AD converter without delay due to sample hold. A successive-approximation type AD converter 1 includes: receiving circuits configured to output the analog input signal according to the received analog input signal; subtractors configured to calculate subtraction signals between the analog input signal in each of n successive conversions and comparison signals obtained by DA-converting the control values by DA converters; comparators configured to determine a high-low relationship between the voltages of the subtraction signals and the reference voltage; a control circuit configured to update the control values so that the comparison signals approach the analog input signal based on the comparison results; and an output register configured to output the digital output signal based on the comparison results of the comparators.

Abstract: There is provided a successive-approximation type AD converter and a pipeline type AD converter without delay due to sample hold. A successive-approximation type AD converter 1 includes: receiving circuits configured to output the analog input signal according to the received analog input signal; subtractors configured to calculate subtraction signals between the analog input signal in each of n successive conversions and comparison signals obtained by DA-converting the control values by DA converters; comparators configured to determine a high-low relationship between the voltages of the subtraction signals and the reference voltage; a control circuit configured to update the control values so that the comparison signals approach the analog input signal based on the comparison results; and an output register configured to output the digital output signal based on the comparison results of the comparators.

Abstract: An integrated circuit is provided, including an AD converter; a DC-DC converter converting a received first voltage into a second voltage and providing the second voltage as a power supply voltage of the AD converter; a control part controlling the AD converter and the DC-DC converter. The DC-DC converter includes a first switching element; a second switching element having one end coupled to a reference potential and the other end coupled to one end of the first switching element; a coil coupled to a connection point of the two switching elements; and a current detection part detecting a current flowing to the coil. The control part turns off the first switching element and turns on the second switching element, and after the current detected by the current detection part becomes equal to or smaller than a reference current value, turn off the second switching element to operate the AD converter.

Abstract: To more improve detection accuracy of a magnetic sensor. A magnetic sensor includes a substrate; an element part in which a free layer, a non-magnetic layer, and a pinned layer are stacked on the substrate; and a magnetic flux concentrator, wherein an area of the free layer is larger than an area of the pinned layer in a top view, and the free layer and the magnetic flux concentrator have a first overlap region in which the free layer and the magnetic flux concentrator at least partially overlap in the top view.

Abstract: Provided is a temperature-compensated voltage generating circuit that generates a temperature-compensated voltage which is supplied to an oscillator circuit. The temperature-compensated voltage generating circuit includes a temperature detecting circuit that detects a temperature; a high frequency attenuating part that attenuates at least a part of a frequency component which is higher than a direct-current component of an output of the temperature detecting circuit; an adder that adds the output of the temperature detecting circuit and an output of the high frequency attenuating part; and a compensated voltage generating part that generates the temperature-compensated voltage based on an output of the adder.

Abstract: In a detector apparatus, a first magnetosensitive unit includes first and third magnetic resistor elements arranged next to each other in a moving direction of the to-be-detected unit and electrically connected in series between a first potential and a second potential, a second magnetosensitive unit includes second and fourth magnetic resistor elements arranged next to each other in the moving direction of the to-be-detected unit and electrically connected in series between the first potential and the second potential, and as for resistances for a same magnetic field, a relation of whether or not a resistance of the third magnetic resistor element is higher than a resistance of the first magnetic resistor element is the same as a relation of whether or not a resistance of the second magnetic resistor element is higher than a resistance of the fourth magnetic resistor element.

Abstract: A DA conversion device includes a level determiner determining whether a level of the digital signal or the analog signal is higher than a predetermined threshold value; a DA converter including plural capacitors, an operational amplifier which generates the analog signal, and a plurality of transistors which connects each of the plural capacitors to a first or a second reference voltage according to the digital signal in a first connection state and connects the plural capacitors between an input terminal and an output terminal of the operational amplifier in a second connection state; and a setting part which receives a clock signal and sets gate-source voltages of the plurality of transistors such that the plurality of transistors is in the first connection state in a first period of the clock signal and the plurality of transistors is in the second connection state in a second period of the clock signal.

Abstract: An object is to provide a magnetic sensor module reducing influence of heat generated from a coil on a magnetic sensor. A conventional method requires, on a magnetic sensor chip, multiple temperature measuring circuits corresponding to multiple magnetic sensors, and many pads for connection to an IC chip. Therefore, the problem is increase in size of the sensor chip mounting the sensors and in manufacturing cost. Provided is a magnetic sensor module comprising an IC chip including a first coil, a first pad connected to one end of the coil, and a second pad to the other end; a magnetic sensor chip disposed on the IC chip's surface, including a first magnetic sensor detecting first axial magnetism; a first external output terminal; a first conductive wire for connecting the first pad and terminal; a second external output terminal; and a second conductive wire for connecting the second pad and terminal.

Abstract: A DA conversion device includes a level determiner determining whether a level of the digital signal or the analog signal is higher than a predetermined threshold value; a DA converter including plural capacitors, an operational amplifier which generates the analog signal, and a plurality of transistors which connects each of the plural capacitors to a first or a second reference voltage according to the digital signal in a first connection state and connects the plural capacitors between an input terminal and an output terminal of the operational amplifier in a second connection state; and a setting part which receives a clock signal and sets gate-source voltages of the plurality of transistors such that the plurality of transistors is in the first connection state in a first period of the clock signal and the plurality of transistors is in the second connection state in a second period of the clock signal.

Abstract: To provide a power supply apparatus that can boost input voltage from a low-power input source. A power supply apparatus is provided, including: an inductor connected to an input terminal to which input voltage is applied; a first switch connected between a point between the inductor and an output terminal, and a ground terminal; a drive unit operating the first switch using a signal having amplitude corresponding to the input voltage; and a control unit controlling operation of the first switch and/or outputting of output voltage from the output terminal, according to the output voltage output at the output terminal, wherein the control unit has a first hysteresis comparator, for controlling operation of the first switch, detecting the output voltage output at the output terminal, and/or a second hysteresis comparator, for controlling outputting of the output voltage, detecting the output voltage output at the output terminal.

Abstract: Provided is an infrared light emitting device with high emission intensity. The infrared light emitting device includes: a semiconductor substrate; a first compound semiconductor layer; a light emitting layer containing at least In and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s); a third compound semiconductor layer; and a second compound semiconductor layer containing at least In, Al, and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s), in which the first compound semiconductor layer includes, in the stated order, a first A layer, a first B layer, and a first C layer, each containing at least In and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s), and the proportion(s) of the Al composition or the Al composition and the Ga composition of each layer satisfy a predetermined relation(s).

Abstract: A light emitting and receiving apparatus includes a controller and a calculator. The controller acquires a first detection current from a light-receiving element when supplying a first drive current to a light-emitting element and acquires a second detection current from the light-receiving element when supplying a second drive current to the light-emitting element. The calculator generates a signal indicating deterioration of the light-emitting element when a reference value and an aging value satisfy a deterioration judgment condition, the aging value being a ratio between the first detection current and the second detection current. The detection accuracy of the light emitting and receiving apparatus is thereby improved.

Abstract: An optical density measuring apparatus for measuring density of a gas or a liquid to be measured includes a light source capable of irradiating light into a core layer, a detector capable of receiving light propagated through the core layer, and an optical waveguide that includes a substrate and the core layer. The core layer includes a light propagation unit and a first diffraction grating unit that receives light from the light source and guides the light to the light propagation unit, which includes a propagation channel capable of propagating light in an extending direction of the light propagation unit. The first diffraction grating unit is disposed near to and facing a light-emitting surface of the light source. The first diffraction grating unit includes first diffraction gratings, at least two of which receive light emitted from the same light-emitting surface of the light source.

Abstract: An optical density measuring apparatus and an optical waveguide capable of increasing the degree of design freedom are provided. The optical density measuring apparatus is for measuring density of a gas or a liquid to be measured and includes a light source capable of irradiating light into a core layer, a detector capable of receiving light propagated through the core layer, and an optical waveguide. The optical waveguide includes a substrate and the core layer, which includes a diffraction grating unit and a light propagation unit capable of propagating light in an extending direction of the light propagation unit. The diffraction grating unit and a portion of the core layer are separated in the thickness direction of the optical waveguide.

Abstract: To achieve a size reduction of a semiconductor package while securing stability in mounting. Three terminals t1, t2, and t4 are individually arranged on a semiconductor package 10 having a rectangular shape as viewed in plan in such a manner that the center in the longitudinal direction of the semiconductor package 10 of each of the three terminals t1, t2, and t4 and the center in the longitudinal direction of each of the other terminals are not overlapped with each other as viewed from the side of the long side.

Abstract: There is provided a nonvolatile storage element having excellent charge holding characteristics capable of reducing variations in electric characteristics and an analog circuit provided with the same. A nonvolatile storage element is provided with a charge holding region and an insulator surrounding the entire surface of the charge holding region and having halogen distributed in at least one part of a region surrounding the entire surface.

Abstract: A Hall sensor having a ball portion on a magnetosensitive portion is provided. A Hall sensor is provided, including: a substrate; a magnetosensitive portion formed on the substrate; an insulating film formed on the magnetosensitive portion; an electrode portion formed on the insulating film; and a ball portion which is provided on the electrode portion and is electrically connected to the electrode portion, wherein in plan view, a projection area of the ball portion accounts for 10% or more of a projection area of the magnetosensitive portion. The projection area of the ball portion may account for 20% or more of the projection area of the magnetosensitive portion. A bonding wire which is electrically connected to the ball portion and is extended from the ball portion in a direction perpendicular to an upper surface of the electrode portion may be further included.

Abstract: Provided are an optical device that is a small and thin optical device including a redistribution layer and has high light emitting efficiency and light receiving efficiency, and a method for manufacturing the optical device. An optical device includes: a photoelectric conversion element configured to include a semiconductor substrate, a semiconductor layer capable of receiving or emitting light, and electrodes; a sealing portion configured to expose a surface of the photoelectric conversion element on the opposite side to an electrode-formed surface of the photoelectric conversion element on which the electrodes are formed; a redistribution layer configured to include a reflecting portion disposed in a region in which, when viewed in plan, the semiconductor layer and the electrodes do not overlap each other and configured to reflect the light to a side on which the semiconductor layer is located; and external connection terminals configured to be coupled to the redistributions.

Abstract: Provided is an infrared light emitting device with high emission intensity. The infrared light emitting device includes: a semiconductor substrate; a first compound semiconductor layer; a light emitting layer containing at least In and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s); a third compound semiconductor layer; and a second compound semiconductor layer containing at least In, Al, and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s), in which the first compound semiconductor layer includes, in the stated order, a first A layer, a first B layer, and a first C layer, each containing at least In and Sb and having a predetermined range(s) of Al or Al and Ga proportion(s), and the proportion(s) of the Al composition or the Al composition and the Ga composition of each layer satisfy a predetermined relation(s).