Adv Antest Corporation

Masahiko Muto

Takeshi Takahashi

Takashi Kusaka

Hideki Ichikawa

Masayuki Tomita

Kiyoshi Hashiba

Akio Morikawa

Provided is a measurement apparatus that measures power of a modulated signal that is modulated with a carrier signal having a prescribed frequency, comprising an AD converting section that outputs a digital modulated signal obtained by AD converting the modulated signal; a frequency converting section that converts the digital modulated signal into a frequency component signal representing a plurality of signal components at respective frequencies; a correction coefficient output section that outputs, for each frequency, a correction coefficient corresponding to a frequency characteristic of a transmission path on which the modulated signal is transmitted; a correcting section that corrects the signal component of each frequency in the frequency component signal using the correction coefficient of the corresponding frequency; and a power calculating section that calculates the power of the modulated signal based on the signal component of each frequency in the corrected frequency component signal.

Measurement apparatus and recording medium

It is possible to reduce errors generated between multiple D/A conversion paths. A characteristic acquisition device includes [1] an arbitrary signal generator that converts a first (second) input digital pattern into a first (second) output analog pattern, [2] a digitizer that converts a first input analog pattern into a first output digital pattern, and [3] a characteristic acquisition device that includes a first transmission characteristic deriving unit that derives a first transmission characteristic which converts the first input digital pattern into the output digital pattern where the input analog pattern is the first output analog pattern, a second transmission characteristic deriving unit that derives a second transmission characteristic which converts the second input digital pattern into the output digital pattern where the input analog pattern is the second output analog pattern, and a transmission characteristic ratio deriving unit that derives a transmission characteristic ratio which is a ratio relating to the first transmission characteristic and the second transmission characteristic.

Characteristic acquisition device, method and program

The present invention can control the power of an output from a device, which changes the amplitude of an input and outputs a result of the change, according to the frequency of the input so that the power is close to a desired value. An output control system () includes an amplitude changer () which controls the ratio of a change in amplitude according to a control signal, a discrete attenuator () which outputs an output signal obtained by attenuating an output from the amplitude changer while discretely setting an amount of the attenuation, a measurement result changer () which changes a measurement result of the output signal, a set voltage recording unit () which records a correspondence between a value of the control signal and a value of the output signal when the input signal is at a predetermined frequency, a measurement result correcting unit () which corrects an output from the measurement result changer () according to the frequency of the input signal, a target value correcting unit () which corrects a target value of the output signal according to the frequency of the input signal, a voltage setting unit () which sets the value of the control signal, an attenuation setting unit () which sets the amount of the attenuation according to the frequency of the input signal and a change setting unit () which sets an amount of the change provided by the measurement result changer ().

Signal output device, signal output control method, program and recording medium

The frequency of an adjacent channel signal is reduced by a down converter (), wherein the signal (adjacent channel signal) in a predetermined band centered around the adjacent channel frequency passes through a band-pass filter (). At this time, a signal out of the predetermined band among the signals output from the down converter () by the band-pass filter () passes through the filter (). An FFT section () outputs the signal having passed through the band-pass filter () by making it correspond with a frequency so that a first power measuring section () is used for power measurement on the basis of only the signal in a predetermined band. Therefore, power on an adjacent signal is accurately measured upon reception of a measurement signal.

Adjacent channel leakage power ratio measuring apparatus, channel power measuring apparatus method, program, and recording medium with recording the program

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Saitama, Japan

Masahiko Muto