Digital jitter meter aids Blu-ray disc testing

The latest version of the TA220 digital jitter meter has new features designed to aid adjustment and inspection in production-line testing of the next generation of Blu-ray high-density optical discs.

Yokogawa has introduced a new version of its TA220 digital jitter meter with new features designed to aid adjustment and inspection in production-line testing of the next generation of Blu-ray high-density optical discs.

New functions incorporated as standard include a data-to-clock high-speed calculation mode, in which the measurement result can be refreshed every 2ms when measuring the data-to-clock jitter, compared with the normal refresh rate of 50ms at a gate time of 30ms.

Also included is a data-to-clock jitter measurement function which excludes the edges adjacent to 2T marks and spaces, making it suitable for testing the higher-capacity dual-layer Blu-ray discs.

Available as an option is a limit equaliser function incorporating a DSP-based nonlinear equaliser circuit to carry out tests specified in the Blu-ray disc standard.

If required, the limit equaliser option can be installed along with the conventional equaliser circuit.

In addition to the Blu-ray disc equaliser and a phase-lock-loop (PLL) circuit that allow direct measurement of jitter from RF signals, the TA220 incorporates Ethernet and GPIB communication functions as standard.

Blu-ray is a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA), a group of leading consumer electronics and PC companies.

The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.

A single-layer Blu-ray disc can hold 25Gbyte, which can be used to record over two hours of HDTV or more than 13 hours of standard-definition TV.

There are also dual-layer versions of the discs that can hold 50Gbyte.

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