Anritsu Corporation

Tatsuya Iwai

Hironori Yoshioka

Hiroyuki Onuma

Yasuo Hosaka

Tomoaki Kabasawa

There are provided a waveform memorythat stores waveform data of an arbitrary waveform, a control unitthat outputs the waveform data stored in the waveform memory in time-series order at predetermined time intervals, and a waveform signal generation unitthat generates a waveform signal by performing digital-analog conversion on the waveform data output under the control of the control unit. A data processing unitthat sequentially calculates, when generating a pulse pattern waveform, waveform data in time-series order based on pulse pattern data is further provided, and the control unit outputs the sequentially calculated waveform data at predetermined time intervals from the data processing unit to the waveform signal generation unit, and causes the waveform signal generation unit to generate a waveform signal by performing digital-analog conversion.

Arbitrary waveform generation apparatus and arbitrary waveform generation method

An error rate measurement apparatus includes a display unit that displays a setting screen for setting a measurement condition of an error rate of an input signal from a DUT, and a processing unit that calculates a measurement time based on the measurement condition input to the setting screen, in which the setting screen includes a target confidence level input portion for inputting a target confidence level, a transmission rate input portion for inputting a transmission rate, a target error rate input portion for inputting a target error rate, an assumed-number-of-errors input portion for inputting an assumed number of errors during the measurement time, and a measurement time display portion for displaying the measurement time.

Error rate measurement apparatus and error rate measurement method

An error rate measurement apparatus includes a provisional confidence level calculation unit that calculates a provisional confidence level CLx by using the sum x, an upper and lower limit value update unit that substitutes the sum x for the variable min_x in a case where the provisional confidence level CLx is equal to or lower than a target confidence level CL, and substitutes the sum x for the variable max_x in a case where the provisional confidence level CLx is higher than the target confidence level CL, and a measurement time calculation unit that calculates, in a case where changes in a value of the sum x calculated by the average value calculation unit are converged in a predetermined range, a value obtained by dividing the converged sum x by a product of a data rate and a target error rate ER, as the measurement time.

The signal generation apparatus includes a phase difference calculation processing unit that calculates an initial phase difference between a division clock or an external clock selected by a clock selection unit and an initial value of the phase of the toggle pattern based on a relationship between the voltage value acquired by the phase acquisition processing unit and a change amount from the initial value of the phase of the toggle pattern, and a phase shift processing unit that moves the phase of the toggle pattern from the initial value by the initial phase difference such that a phase difference between the division clock or the external clock selected by the clock selection unit and the toggle pattern is within a predetermined range.

Signal generation apparatus and signal generation method

A signal generation device includes m transceivers, a usage amount determination unit that executes a usage amount determination process that determines the usage amount of the FIFO of each transceiver, and a phase adjustment unit that adjusts the phase of the read clock signal for the FIFO. The signal generation device performs the second usage amount determination process on the condition that the count that the usage amount of the FIFO of each transceiver is determined to be less than the usage amount threshold by the first usage amount determination process consecutively reaches the first determination count, and terminates the adjustment of the phase of the read clock signal on the condition that the count that the usage amount of the FIFO of each transceiver is determined by the second usage amount determination process to be greater than the usage amount threshold consecutively reaches the second determination count.

Signal generation device and signal generation method

There are provided a signal generator capable of flexibly increasing the number of taps while realizing high-speed emphasis switching and an emphasis switching method using the signal generator. A signal generator includes: an emphasis addition circuit including at least one finite impulse response (FIR) filter unit that generates an emphasis waveform pattern by adding an emphasis to a pattern of a pulse amplitude modulation (PAM) signal including multi-values which are two or more values; and a tap value setting unit that switches M tap values C(0), C(−1), . . . , and C(1−M) and sets the M tap values C(0), C(−1), . . . , and C(1−M) to each FIR filter unit according to an emphasis switching request from a DUT. The FIR filter unit is configured on an FPGA or an ASIC.

Signal generator and emphasis switching method using signal generator

There are provided a data comparison unit that detects an FEC symbol error of a signal under test output from a DUT in accordance with an input of a jitter signal, an error counting unit that counts the number of detected FEC symbol errors for each codeword for each phase modulation amount, a codeword classification unit that classifies a plurality of codewords included in the signal under test into a plurality of groups based on the counted number of FEC symbol errors, a codeword number counting unit that counts the number of codewords in each group for each phase modulation amount, and a display control unit that controls a display of a first graph having a horizontal axis as the phase modulation amount and a vertical axis as a ratio of the number of codewords in each group, on a display screen.

Jitter tolerance measurement apparatus and jitter tolerance measurement method

Provided are a spread spectrum clock generator and a spread spectrum clock generation method, a pulse pattern generator and a pulse pattern generation method, and an error rate measuring device and an error rate measuring method capable of improving usability when adjusting a waveform of a modulation signal during training. A setting screenincludes a 0-th frequency shift input unitfor arbitrarily setting a frequency shift of a waveform of a modulation signal in a plurality of time sections, a first frequency shift input unit, a second frequency shift input unit, a third frequency shift input unit, and a modulation selection unitfor switching a waveform pattern of the modulation signal from a first pattern to a second pattern.

Spread spectrum clock generator and spread spectrum clock generation method, pulse pattern generator and pulse pattern generation method, and error rate measuring device and error rate measuring method

[Task] There is provided a signal generation apparatus and a signal generation method capable of performing mutual switching between a PAM N signal having n values and a PAM M signal having m values (m&#x3c;n) without generating a noise or an overvoltage. [Means for Resolution] There are provided a PAM N generation circuitthat generates a PAM N signal of n values, a PAM M generation circuitthat generates a PAM M signal of m values (m&#x3c;n) having a maximum voltage level equal to a maximum voltage level of the PAM N signal generated by the PAM N generation circuit, and a selectorthat outputs any one of the PAM N signal generated by the PAM N generation circuitand the PAM M signal generated by the PAM M generation circuit

Provided are a spread spectrum clock generator and a spread spectrum clock generation method, a pulse pattern generator and a pulse pattern generation method, and an error rate measuring device and an error rate measuring method capable of performing SSC modulation of any frequency shift according to a standard. Included are a reference signal generatorthat generates a reference signal, a modulation waveform generatorthat generates a modulation waveform, a modulation unitthat frequency-modulates the reference signal with the modulation waveform to generate an SSC modulated signal, and a modulation control unitcapable of arbitrarily controlling the frequency shift of the modulation waveform and a slope of the frequency shift in any time section.

A signal generator includes inverse characteristic calculation means for calculating an inverse characteristic of a transfer function from an inverse characteristic of a frequency characteristic of a signal based on the transmission standard, inverse Fourier transform means for calculating impulse responses of a plurality of points by performing inverse Fourier transform on the inverse characteristic of the transfer function, impulse response cutout means for cutting out the points for a predetermined number of taps from the impulse response, frequency characteristic calculation means for calculating a frequency characteristic based on values of the points for the number of taps cut out from the impulse response, and display control means for displaying on a display screen, the frequency characteristic calculated by the frequency characteristic calculation means and an ideal frequency characteristic read from an S parameter file of a device under test.

Signal generator and frequency characteristic display method using signal generator

In a signal generating device, first signal generation meansfor generating a most significant bit signal stream MSB, second signal generation meansfor generating a least significant bit signal stream LSB, a mask generation meansfor defining a bit that allows error insertion and a bit that prohibits error insertion with different pieces of bit information, and generating a mask pattern of each of the most significant bit signal stream MSB and the least significant bit signal stream LSB, based on symbol transition information indicating a transition destination of four PAM4 symbols of a PAM4 signal; and error insertion meansfor inserting an error, based on bit information of the mask pattern corresponding to each bit of the most significant bit signal stream and the least significant bit signal stream designated according to a symbol error rate.

Signal generating device, signal generating method, error rate measuring apparatus, and error rate measuring method

Provided is a signal generating apparatus including an inverse characteristic calculation unit that sets an amplitude characteristic of a signal as input data to calculate an inverse characteristic of a transfer function from an inverse characteristic of the amplitude characteristic of the input data, an inverse Fourier transform unit that performs inverse Fourier transform of the inverse characteristic of the transfer function, an impulse response extract unit that extracts points corresponding to a desired number of taps on the basis of a peak of the impulse response obtained by the inverse Fourier transform unit, a power spectrum calculation unit that calculates a power spectrum on the basis of values which are extracted from the impulse response, and a loss value correction unit that corrects a loss value of the power spectrum by using a loss value correction curve.

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Kanagawa, Japan

Tatsuya Iwai