Abstract: [Task] There are provided a coil that is simple in structure and excellent in high frequency characteristics and a method for manufacturing the same. [Means for Resolution] The coil includes a plurality of conductor patterns 11 formed at an interval from each other on a substrate 21, and metal wires 12 that electrically connect an end of one conductor pattern of conductor patterns adjacent to each other with an end of the other conductor pattern that is an end opposite to the end of the one conductor pattern. One or more spiral shapes are formed by two or more conductor patterns 11 and one or more metal wires 12. The coil includes a core material 13 that is arranged at least in a portion inside a space surrounded by one or more spiral shapes to cover the outer peripheries of the metal wires 12 at least over a predetermined range.

Abstract: A signal analyzer for facilitating observation of a relative value, i.e., the quantity of variation in power between slots, at the time of analyzing the power of a signal which is to be measured and subjected to power control in units of slot. An analyzing section detects the power value of every slot of a signal which is to be measured and received at a receiving section, and calculates the relative value of the power value between each slot and a slot separated therefrom by a predetermined number. A display control section displays the relative values thus calculated as a graph at a display section by arranging them continuously in time series.

Abstract: There is disclosed a general-purpose APD measurement apparatus capable of changing a measurement condition, such as the number of channels or a resolution bandwidth (RBW) in compliance with a standard for the subject of measurement, measuring various subjects of measurement, and correcting measurement equipment, thereby enabling a higher accuracy of measurement. The resolution bandwidth (RBW) or the number of channels when measurement is performed can be flexibly changed by controlling the cycle of a clock signal whose data are sampled by A/D conversion means 110, frequency selection means 130, and an APD unit 300. The frequency selection means 130 includes FFT type processing means 131 and filter bank type processing means 132 arranged in parallel. The output of FFT type processing means 131 is corrected based on the output of the filter bank type processing means 132 with a high accuracy of measurement. Accordingly, a higher accuracy of measurement is made possible.

Abstract: To provide a signal generating device and a signal generating method capable of correcting the frequency characteristics of the level of a broadband radio-frequency signal. A signal generating device 10 includes a waveform data storage unit 11 that stores waveform data of a baseband signal, a quadrature modulator 20 that generates a modulation signal from the baseband signal, a local oscillator 31 that generates a local oscillation signal, a multiplier 32 that multiplies the modulation signal and the local oscillation signal to generate a radio-frequency signal in a predetermined frequency band, a frequency characteristic correction value determining unit 50 that acquires the frequency characteristics of the signal level of the frequency band on the basis of the center frequency of the radio-frequency signal, and a DF 12 that corrects the frequency characteristics of the level of the baseband signal.

Abstract: An error addition apparatus receives a data signal D having a frame format having a specific signal inserted into its front, adds errors to the data signal D, and outputs a resulting signal. The apparatus has an error addition regulation unit for receiving a frame synchronization signal F, indicative of a timing at which the front of the frame of the data signal has been inputted, and regulating the errors such that the errors are added to positions other than a region of the specific signal. Accordingly, errors are not added to a specific signal.

Abstract: The present invention provides a semiconductor light emitting element that can obtain oscillation at desired wavelengths. The semiconductor light emitting element comprises a semiconductor substrate 11, an active layer 12 for emitting and propagating light, which is formed in a stripe shape above the semiconductor substrate 11, buried layers 13a, 13b formed on both lateral sides of the active layer 12, a cladding layer 16 formed above the active layer 12 and the buried layers 13a, 13b, a first electrode 17a formed above the cladding layer 16, and a second electrode 17b formed below the semiconductor substrate 11. The active layer 12 opens on one end facet 14a among the two end facets formed by cleavage so that the active layer 12 makes a predetermined angle to the normal direction of the one end facet 14a.

Abstract: To provide a mobile communication terminal test device and a mobile communication terminal test method capable of displaying the theoretical value of a packet transmission rate. A mobile communication terminal test device 1 includes a pseudo base station device 10 that is connected between a mobile communication terminal 5, which is a test target, and a virtual connection device 20, a table storage device 30 that stores various tables, a parameter input unit 50 that inputs information about TM, MCS, and NRB, a TBS acquiring unit 41 that acquires TBS on the basis of the input information and various tables stored in the table storage device 30, a packet transmission rate calculating unit 43 that calculates the theoretical value of the packet transmission rate from TBS, and a display unit 93 that displays the theoretical value of the packet transmission rate.

Abstract: A communication test device can assist in identifying a cause of a change in throughput of a mobile communication terminal. The communication test device accumulates (a) trace data on a specific unit of data complying with a designated communication standard, and (b) throughput data on throughput of the specific unit of data transmitted to and received from a mobile communication terminal. Trace data and throughput data are extracted from the accumulation, and trace data is displayed. A graph of the variation of throughput with time is displayed on the display unit. Trace data corresponding to a time designated by an operating unit can also be displayed.

Abstract: A communication test device can assist in identifying a cause of a change in throughput of a mobile communication terminal. The communication test device accumulates (a) trace data on a specific unit of data complying with a designated communication standard, and (b) throughput data on throughput of the specific unit of data transmitted to and received from a mobile communication terminal. Trace data and throughput data are extracted from the accumulation, and trace data is displayed. A graph of the variation of throughput with time is displayed on the display unit. Trace data corresponding to a time designated by an operating unit can also be displayed.

Abstract: To provide a mobile communication terminal test device and a mobile communication terminal test method capable of enabling a tester to intuitively know a set transmission power variation. A mobile communication terminal test device 1 includes: a pseudo base station device 10 that transmits and receives a signal to and from a mobile communication terminal 5; a transmission power setting display processing unit 22 that generates an input screen for inputting the set values of the transmission power of the pseudo base station device 10 and a variation in the transmission power over time; an operation unit 31 that inputs the set values; a transmission power graph display processing unit 23 that generates a graph indicating the variation in the transmission power over time using the set values; and a display unit 33 that displays the graph.

Abstract: It is possible to check the settings of multiplex communication for test or the state of multiplex communication during the test. A test device tests whether a mobile communication terminal, which is a test target, performs a communication operation normally and displays a list of at least the address of the mobile communication terminal and information for identifying a communication partner of the mobile communication terminal as multiplex communication related information when the mobile communication terminal performs multiplex communication on a multiplex communication related display unit 6d of a display unit 6.

Abstract: To reduce the load of a communication process performed between pseudo base stations of different communication standards. An LTE pseudo base station unit 3 includes: an LTE message processing unit 3b that transmits broadcast information including base station information about a C2K pseudo base station unit 4 to a mobile communication terminal 10, which is a test target, extracts location registration request message information from data when receiving the data including the location registration request message information as response message information to the transmitted broadcast information, and outputs the location registration request message information; and a specific C2K message processing unit 3c that outputs the location registration request message information as response message information when receiving the location registration request message information from the LTE message processing unit 3b.

Abstract: To accurately test the operating state of the APD measuring device. A test device 40 includes a test signal generator 41 that generates a test signal corresponding to the center frequency of a signal to be measured and a control unit 42 that variably controls the amplitude level of a test signal in the dynamic range of an APD measuring device 1 at random, in order to test the operating state of the APD measuring device 1.

Abstract: To provide a signal generator, a signal generating system, and a signal generating method capable of repeatedly generating an arbitrary waveform and making the phases of the head and tail of the generated waveform continuous with each other, without changing the frequency of the waveform. A signal generator (10, 11, 12) includes phase shift means (30) that receives waveform data which is repeatedly output n times, shifts the phase of each sample data item in an n-th waveform data item by a phase shift amount ?n corresponding to the number of times n the waveform data is repeatedly output, and outputs the waveform data to D/A conversion means.

Abstract: To provide a quadrature modulator, a signal generating device, and a quadrature modulation method capable of correcting a gain balance error, a zero offset error, and an orthogonality error that occur during quadrature modulation. The quadrature modulator 20 includes a quadrature modulation unit 22, a quadrature modulation error calculating unit 40 that calculates quadrature modulation errors on the basis of the power of a quadrature-modulated signal output from the quadrature modulation unit 22, and an error correcting unit 30 that corrects a baseband signal such that the quadrature modulation errors are removed. The quadrature modulation error calculating unit 40 includes a power measuring unit 41 that measures the power of the quadrature-modulated signal, a gain balance error calculating unit 42, a zero offset error calculating unit 43, and an orthogonality error calculating unit 44.

Abstract: Herein disclosed is an optical modulation device, comprising: a substrate 1 having a polarization non-reversal region 17a and a polarization reversal region 17b; an optical waveguide 18 including first and second branched optical waveguide portions 18a, 18b; and a traveling waveguide including a center electrode 19a and a ground electrode 19b, 19c to have an electric signal applied thereto, said traveling waveguide and said first and second branched optical waveguide portions collectively forming an interaction portion to have said incident light interacted with said electric signal, said interaction portion being constituted by a first interaction sub-portion 20a and a second interaction sub-portion 20b, said first and second interaction sub-portions being respectively positioned in regions of said substrate having opposite polarization orientations with each other, in which said center electrode is positioned in face to face relationship with one of said first and second branched optical waveguide portions

Abstract: A communication test device can assist in identifying a cause of the change in throughput of a mobile communication terminal. The device includes accumulating means for accumulating trace data on a specific unit of data complying with a designated communication standard, and throughput data on throughput of the specific unit of data transmitted to and received from a mobile communication terminal, extracting means for extracting trace data and throughput data from the accumulating means, trace display means for displaying trace data on a display unit, throughput display means for displaying a graph of the variation with time of throughput on the display unit, and time obtaining means for obtaining a time. The extracting means is adapted to extract, from the accumulating means, trace data corresponding to time designated by an operating unit. The trace display means displays the trace data corresponding to the time on the display unit.

Abstract: There are provided a photodiode 11, an inverting amplifier 12 which includes an operational amplifier 12a and a first resistor 12b, a second resistor 21 which has a smaller resistance value than the first resistor 12b and which is inserted between the positive side of a power supply and the photodiode 11, a differential amplifier 22 which outputs a voltage across both ends of the second resistor 21, and a diode 23 which is connected between a ground and a connection point between the photodiode 11 and an inverting input terminal of the operational amplifier 12a and which changes to a non-conductive state when the inverting amplifier 12 is not saturated and changes to a conductive state when the inverting amplifier 12 is saturated so that the output current of the photodiode 11 is bypassed.

Abstract: In a frequency converting system, an input signal x(t) is supplied to a signal branching section for dividing a predetermined frequency domain into M bands, extracting signal components of the respective divided bands. The respective signal components and local signals each including a frequency difference corresponding to a predetermined intermediate frequency with respect to a center frequency of each band are input to a frequency converting part. The signals of the respective divided bands are converted into signals of intermediate frequency bands each including the predetermined intermediate frequency as the center frequency, the conversion outputs are sampled by using a common clock signal, whereby the conversion outputs are converted into digital signals. Further, after being subjected to phase correction processing, the digital signals are subjected to frequency conversion and combination processing by a signal regeneration part.

Abstract: An OPU frame generating device includes a frequency setting unit that sets a frequency corresponding to a bit rate of data which can be stored in a payload area, a parameter calculating unit that calculates a parameter Cm indicating an integer part of the amount of data included in the payload area using the set frequency, a data inserting unit that outputs a timing signal determined by the parameter Cm and inserts data at a position determined by the parameter Cm in the payload area, a data generating unit that generates data in synchronization with the timing signal, and a frame generating unit that generates an OPU frame having the payload area into which the data is inserted.