Whip transmission characteristics measurement device

Abstract

An apparatus for rapidly measuring jitter transfer characteristics is provided. A modulation signal generator generates a modulation signal M including a plurality of sinusoidal components having known amplitudes m1 to mn and different frequencies f1 to fn, and outputs the modulation signal M to a jitter generator. A clock signal C phase-modulated by the modulation signal M is input to a data signal generator, a data signal D synchronized with the clock signal C is provided to a measurement object, a data signal D' output from the measurement object is input to a clock recovery unit to recover a clock signal component C', and the clock signal component C' is phase-detected by a phase detector. A signal amplitude detector detects the amplitudes of the plurality of sinusoidal components included in the modulation signal M from an output signal M' of the phase detector, and an operation processor calculates a ratio of the detected amplitudes and the known amplitudes for each of the sinusoidal components, respectively.

Description

technical field [0001] The present invention relates to a technology for quickly measuring the jitter transmission characteristics of various devices (data relays, etc.) that read and process input data signals. Background technique [0002] In equipment such as a data repeater, in order to prevent the waveform degradation of the data signal, the clock signal component is separated from the input data signal, and the data signal is read when the level of the clock signal is changed, and the read data is output. Signal. [0003] As the performance required in such a device, the degree of improvement in jitter (phase fluctuation) of an input data signal, that is, the transmission capability of suppressing jitter is defined as the jitter transmission characteristic. [0004] In order to measure this jitter transfer characteristic, prior art utilizes structures such as Figure 7 The jitter transmissibility measurement device 10 is shown. [0005] This jitter transmission chara...

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Problems solved by technology

[0013] However, in the above-mentioned conventional jitter transmission characteristic measurement device, when obtaining the amplitude V' of the detection output M, it is necessary to perform averaging processing in consideration of influences such as noise. It takes a long time to obtain the amplitude V' of the points of the required jitter frequency, which is inefficient

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