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High sensitivity limiting post amplifiers tweaked for 10Gbit/s

Posted: 23 Jul 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Micrel? OTL? Ethernet? Fibre Channel?

Micrel recently unveiled its latest line of limiting post amplifiers. The SY88053CL and SY88063CL are designed for FTTH XGPON and 10GEPON OLT (Optical Line Terminal) applications supporting the build out of next generation PON networks. The product line can also be used in fibre optic transceiver modules for multi-rate applications up to 12.5Gbit/s supporting Ethernet, Fibre Channel, OTN, and CPRI/OBSAI data rates.

"These new devices offer an impressive number of features including a new level of high bandwidth, high input sensitivity with programmable, wide range SD Assert and LOS De-Assert threshold levels, 4dB of electrical hysteresis, and stable SD Assert and LOS De-Assert timing to meet the stringent requirements of next generation PON networks," stated Tom Kapucija, director of marketing for the high speed communications business, Micrel. "These features enable link efficiency optimisation with increased system reach, higher link up-time and higher payload bandwidth."

Both devices incorporate fast SD Assert and LOS De-Assert times across the entire differential input voltage range of 5mVPP to 1800mVPP which enables improved link efficiency and optimisation. Electrical hysteresis of 4dB is provided across a wide LOS/SD threshold range of 3mVPP to 30mVPP. Integrated 50 input and output impedances optimise high speed signal integrity while reducing external component counts and in turn, cost. The TTL compatible JAM input enables a SQUELCH function by routing back the LOS or SD signal.

The SY88053CL enables user adjustable decision threshold adjustment for optimised Bit Error Rate operation in noisy applications with asymmetrical noise distribution while the SY88063CL provides a user selectable Digital Offset Correction function that automatically compensates for internal device offsets in the high speed data path.

Other features include multi-rate operation of 1Gbit/s to 12.5Gbit/s; selectable LOS or SD output; selectable RXOUT+ / RXOUT- signal polarity (SY88053CL); and 25ps typical rise/fall times. Improved module manufacturability and reduced cost are achieved via the increased performance margin versus current customer requirements. The enhanced link efficiency and higher data throughput are the result of higher downstream splits per node and the additional margin to the 512ns link setup budget. Extended reach and higher data throughput are achieved via optimised BER in noisy environments and compensation for asymmetrical noise profiles of EDFA or RAMAN optical amplifiers.

Both devices offer a wide power supply range of 3.3V 10 per cent and come in an industrial temperature range of -40C to 85C and a tiny 3x3mm QFN package.





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