Anritsu Corporation

Tatsuro Hanaya

Shinichi Ito

Jun Ono

Akihisa Kumaki

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 modulatorincludes a quadrature modulation unit, a quadrature modulation error calculating unitthat calculates quadrature modulation errors on the basis of the power of a quadrature-modulated signal output from the quadrature modulation unit, and an error correcting unitthat corrects a baseband signal such that the quadrature modulation errors are removed. The quadrature modulation error calculating unitincludes a power measuring unitthat measures the power of the quadrature-modulated signal, a gain balance error calculating unit, a zero offset error calculating unit, and an orthogonality error calculating unit

Quadrature modulator, signal generating device, and quadrature modulation method

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 () includes phase shift means () 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 &#x3c6;corresponding to the number of times n the waveform data is repeatedly output, and outputs the waveform data to D/A conversion means.

Signal generator, signal generating system, and signal generating method

A signal generator has a signal creating and supplying unit which creates a test signal to be transmitted to a measurement object and a license management unit which manages a license of waveform data for use in creating the test signal by the signal creating and supplying unit. The license management unit includes a waveform data memory which stores a plurality of waveform data files, a usable file list taking unit which takes a usable file list for specifying a usable waveform data file authenticated for the signal generator, the usable file list being input from an outside section, a usable file list memory which stores the usable file list, a determining unit which determines whether or not a desired waveform data file is included in the usable file list stored in the usable file list memory, and a waveform data file reading and transferring unit which reads the specified waveform data file from the waveform data memory and transfers the specified waveform data file to the signal creating and supplying unit when the determining unit determines in the affirmative.

Growing community of inventors

Atsugi, Japan

Tatsuro Hanaya