Abstract: A magnetic memory device includes a magnetoresistive element and a first wiring layer. The magnetoresistive element includes a fixed layer, a recording layer, and a non-magnetic layer interposed therebetween. The first wiring layer extends in a first direction and generates a magnetic field for recording data in the magnetoresistive element. The recording layer includes a base portion extending in a second direction rotated from the first direction by an angle falling within a range of more than 0° to not more than 20°, and first and second projections projecting from the first and second sides of the base portion in a third direction perpendicular to the second direction. The third and fourth sides of the base portion are inclined with respect to the third direction in the same rotational direction as a rotational direction in which the second direction is rotated.

Abstract: A magnetic memory device includes a first write wiring which runs in a first direction, a second write wiring which runs in a second direction different from the first direction, and a magnetoresistive element which is arranged at an intersection between the first and second write wirings, has a fixed layer, a recording layer, and a magnetoresistive layer sandwiched between the fixed layer and the recording layer, and has an axis of easy magnetization obliquely with respect to the first and second directions, the recording layer including a first ferromagnetic layer, a second ferromagnetic layer, and a first nonmagnetic layer sandwiched between the first and second ferromagnetic layers, in which first magnetization of the first ferromagnetic layer and second magnetization of the second ferromagnetic layer are ferromagnetically coupled, and a ferro-coupling constant C of a ferromagnetic coupling is 0.0001 erg/cm2?C?0.2 erg/cm2.

Abstract: An n-bit shift register 102 for shifting input data through successive bit stages and AND gates 103-i (i being 1 to n) corresponding to the bit stages of the shift register 102 are provided. A control circuit 101 feeds out control signals 107-i for on-off controlling the feeding of the outputs of the corresponding bit stages of the shift register 102. Multipliers 104-i multiply the on-off controlled data and predetermined filter coefficient data, and an adder circuit 105 adds together the output of the multipliers to derive an FIR filter output including ramp-up and -down. A ramp-up/-down signal is fed to a shift register in the control circuit 101, and ramp-up data is derived from the output of the adder circuit 105. Thus, the circuit can be readily constructed without scale increase.

Abstract: An MTJ element of a magnetic random access memory according to an example of the present invention comprises a first ferromagnetic layer whose magnetization direction is fixed, and a second ferromagnetic layer whose magnetization direction changes in accordance with an applied magnetic field. The second ferromagnetic layer comprises a main body having a long-axis direction, and a jut jutting in a direction different from that of a long axis from the main body.

Abstract: A transmission power control information section issues an indication to a variable gain control amplifier at a predetermined control cycle. The variable gain control amplifier controls a transmission power according to the given indication amount. An adjustment amount generator adjusts the indication amount to be given to the variable gain control amplifier while maintaining a change in the transmission power between an indication from a transmission power control information section and subsequent indication within a predetermined range.

Abstract: A magnetoresistive element includes a first ferromagnetic layer having a first magnetization, the first magnetization having a first pattern when the magnetoresistive element is half-selected during a first data write, a second pattern when the magnetoresistive element is selected during a second data write, and a third pattern of residual magnetization, the first pattern being different from the second and third pattern, a second ferromagnetic layer having a second magnetization, and a nonmagnetic layer arranged between the first ferromagnetic layer and the second ferromagnetic layer and having a tunnel conductance changing dependent on a relative angle between the first magnetization and the second magnetization.

Abstract: A magnetoresistive element according to an example of the present invention has a stacked structure comprised first and second ferromagnetic layers and a nonmagnetic layer disposed between these ferromagnetic layers, and a planar shape of at least one of the first and second ferromagnetic layers has a shape formed by combining two or more parts each having a shape of a character C.

Abstract: A baseband signal multiplexing circuit controls an amplitude level of a baseband signal to be transmitted on the basis of the number of transmission codes. A gain set value is calculated with which an amplitude value of the baseband signal outputted from a level adjustment circuit is adjusted to an amplitude value matching a dynamic range of a D/A converter based on transmission code number information transmitted from a signal processor. The level adjusting circuit is notified of the gain set value with a control signal.

Abstract: There is a problem that a delay is caused in signal processing by exercising control so as to cause amplitude peaks in a transmission signal to fall in a prescribed range. A transmission apparatus for conducting wireless communication makes a decision whether a specific pattern which causes a peak exceeding a predetermined amplitude range to be generated in frequency characteristics of a transmission signal is included in a transmission code sequence for forming the transmission signal. And the transmission apparatus selects filter coefficients which prescribe a band limiting factor for the frequency characteristics of the transmission signal, on the basis of a result of the decision, and conducts filtering on the transmission code sequence by using the selected filter coefficients.

Abstract: Mobile communication equipment comprises a power amplifier for amplifying a transmission signal and a feedback circuit for providing feedback to allow the above-described power amplifier to output a transmission-power set value.

Abstract: An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffraction component, and a photodetector unit. The photodetector unit may further include a transmitting portion for transmitting the light beam emitted from the light source, and may be disposed opposite the light source in a vicinity of the light source so that light emitted from the light source is transmitted through the transmitting portion. The transmitting portion may be an aperture provided in the photodetector unit. Alternatively, the optical pick-up device may further include an optical path separator for separating the diffracted returning light beam from the light beam that passes from the light source to the diffraction component.

Abstract: An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffraction component, and a photodetector unit. The photodetector unit may further include a transmitting portion for transmitting the light beam emitted from the light source, and may be disposed opposite the light source in a vicinity of the light source so that light emitted from the light source is transmitted through the transmitting portion. The transmitting portion may be an aperture provided in the photodetector unit. Alternatively, the optical pick-up device may further include an optical path separator for separating the diffracted returning light beam from the light beam that passes from the light source to the diffraction component.

Abstract: An optical pickup apparatus for reproducing information from an optical disk, includes: a semiconductor laser applying a beam to an optical disk having two recording layers through an objective lens; and a light receiving device to which light reflected from the optical disk is directed through the objective lens and a beam splitting device, wherein: the beam splitting device has two first light receiving areas for detecting a push-pull signal and a second light receiving area for detecting a focus error signal, and a configuration is provided such that the center of the optical axis of the reflected light in the beam splitting device is made to lie within the second light receiving area for detecting the focus error signal.

Abstract: A decibel level adjustment device that calculates an output signal that is a d decibel multiple of an input signal comprises a plurality of shift circuits, a shift amount control circuit, and adders. The shift circuits shift an input signal by exactly a designated number of bits in a designated direction. The shift amount control circuit receives the value of d as a decibel control value, and in accordance with this decibel control value, generates and outputs control signals that indicate the number of bits to shift and the shift direction of each shift circuit. The adder adds the outputs of the shift circuits.

Abstract: A decibel level adjustment device that calculates an output signal that is a d decibel multiple of an input signal comprises a plurality of shift circuits, a shift amount control circuit, and adders. The shift circuits shift an input signal by exactly a designated number of bits in a designated direction. The shift amount control circuit receives the value of d as a decibel control value, and in accordance with this decibel control value, generates and outputs control signals that indicate the number of bits to shift and the shift direction of each shift circuit. The adder adds the outputs of the shift circuits.

Abstract: An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffraction component, and a photodetector unit. The photodetector unit may further include a transmitting portion for transmitting the light beam emitted from the light source, and may be disposed opposite the light source in a vicinity of the light source so that light emitted from the light source is transmitted through the transmitting portion. The transmitting portion may be an aperture provided in the photodetector unit. Alternatively, the optical pick-up device may further include an optical path separator for separating the diffracted returning light beam from the light beam that passes from the light source to the diffraction component.

Abstract: An optical pick-up device for recording/reading an optical recording medium is provided, which can efficiently utilize light emitted from the laser light source. The optical pick-up device includes a light source, an optical system, a quarter-wave plate, a diffraction component, and a photodetector unit. The photodetector unit may further include a transmitting portion for transmitting the light beam emitted from the light source, and may be disposed opposite the light source in a vicinity of the light source so that light emitted from the light source is transmitted through the transmitting portion. The transmitting portion may be an aperture provided in the photodetector unit. Alternatively, the optical pick-up device may further include an optical path separator for separating the diffracted returning light beam from the light beam that passes from the light source to the diffraction component.

Abstract: A transmission amplifier control circuit which is capable of preventing an adverse effect such as data erroneous transmission due to variations in phase which may occur when plural amplifiers are switched and capable of improving the transmission efficiency and suppressing extra power consumption. The transmission amplifier control circuit includes amplification means 51 to 5n; switching means 6 for selectively switching at least one of the plural amplification means 51 to 5n; detection means 2 for detecting a timing at which the plural amplification means 51 to 5n are switched, using the format of data to be transmitted during data transmission; and amplification means changeover control means 3 for controlling a timing for switching the plural amplification means 51 to 5n, using both a detection signal from the detection means 2 and an output power control signal which is externally input and controls the output power of the transmission amplifier control circuit.

Abstract: An optical disk device performs tracking on a recordable optical disk which has an information recording track and a guiding track for guiding an optical beam to the information recording track, the guiding track having pre-pits including address information recorded therein. This device includes a photodetector which is divided into two divisions by a dividing line which is approximately optically parallel to the tangential line of the information recording track of the optical disk, and receives reflected light of the optical beam which is incident on the information recording track, and a tracking-error-signal generating portion having the respective outputs of the two divisions of the photodetector input thereto and generating a tracking error signal which is used for performing the tracking on the optical disk.

Abstract: An optical pick-up device for at least one of recording, reproducing and deleting data on a recording medium includes a light source emitting a light, an objective lens focusing the light from the light source at a predetermined position of a data track of the recording medium and a light receiving element detecting a reflected light from the recording medium. A light receiving means divides the reflected light from the recording medium in a data track direction and detects a part of the reflected light. The reflected light is divided onto the light receiving element into a central component and peripheral components and an original signal is reproduced from at least one of a difference between the peripheral components and the difference between the peripheral components and a central component.