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SMPTE transceivers eye professional video transport

Posted: 18 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:hdtv? smpte? transceiver? bicmos? cmos?

Even as it has become digitized andwith the gradual rise of HDTVhas moved to higher bit rates, professional video transport has remained immune to the high-speed I/O standards that permeate the rest of the industry. Instead, the TV broadcasters' own standards organization, the Society of Motion Picture and Television Engineers (SMPTE), has dictated transport standards for video signals.

TV studios and production facilities are thus wired not with conventional networks but with dedicated links based on two standardsSMPTE 259 and 292that require their own physical-layer transceivers. Cypress Semiconductor is addressing that need with a BiCMOS family built in a proprietary 0.25?m process.

"These devices could be done in commercial CMOS, but in the 0.25?m BiCMOS process we have a couple of advantages," said Dan Morris, VP at Cypress. "First, we have the right passive components to build good filters, and filters are essential to stabilize the PLLs for these applications. We would require another whole generation of filter technology to do this in CMOS."

"Second, we have 40GHz fTs to work with in taming the 1/f noise. We would have to go all the way to 90nm CMOS to get that kind of performance."

Depending on the measurement and the application, Cypress claims jitter margins of as great as 82 percent, made possible in part by the inclusion of on-chip voltage-controlled oscillators that can meet tight requirements.

The Cypress devices also offer a "fail-safe clock" feature: If the clock is lost on the incoming signal, the parts will provide a clock to downstream devices to prevent them from shutting down.

The family ranges from the CYV15G0101DXB single transceiver to combinations of two- and four-channel devices (some transceivers and some separate transmitters and receivers). In lots of 1,000, prices range from $19 each for the single transceiver to $82 each for a four-channel part with reclocking deserializers.

- Richard Goering

EE Times





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