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The Industry’s Highest Level of Low-Noise and High-Speed Performance
Breaking the Technological Barriers to 8×-Speed Blu-ray Recording and
Playback
Optical Pickup Device that Achieves 8×-Speed Blu-ray Recording and Playback |
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RF/Servo (PDIC) |
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Built-in wideband (230
MHz) I-V amplifier |
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Low noise (-4.4 dB at 176
MHz compared to current
products) |
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Multi-stage gain switching
(IV: 8 stages) |
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High-sensitivity photodetector
(0.3 A/W at 405
nm) |
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Power Monitor (PDIC) |
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Rapid settling: 6 ns (Typ.) |
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Wide-range gain adjustment
function (differential
gain: 0.24 to 44.4 V/mW) |
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Built-in sample-and-hold
circuit |
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Serial interface |
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Laser Diode Driver (LDD) |
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Operating frequency:
16 to 530 MHz |
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Minimum 59 ps (1/32T)
resolution |
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Built-in write strategy |
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Sampling pulse output
for external sample-and-hold
function |
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Maximum drive current
BD: 550 mA, CD/DVD:
1000 mA |
Blu-ray Discs are used in a wide range of
products including recorders, PCs, and
games, and the popularity of this technology
is expected to increase rapidly. To
realize the potential of the Blu-ray Disc
even further, Sony is continuing development
efforts aimed at achieving recording
and playback at Blu-ray Disc speeds
of 8× and higher and at achieving even
higher recording capacities through even
higher layer counts in multilayer Blu-ray
Disc media. Improving the performance
of the optical pickup (OP) is critical to
achieving these goals and in particular,
the photodetector IC (PDIC) and laser
diode driver (LDD) mounted in the OP
hold the key to these improvements. To
achieve 8× Blu-ray Disc recording and
playback, two or more times the bandwidth
of existing 16× DVD recording and
playback OPs and even lower noise are
required. This is extremely difficult for
current device and circuit technologies.
To resolve these Blu-ray Disc issues,
Sony has developed a new BiCMOS process
for PDICs and has achieved both low
noise and fast response times. By increasing
the compatibility with the PDIC while
at the same time increasing the performance
of the LDD as well, Sony has proposed
a new architecture for 8×-speed
Blu-ray Disc recording and playback. |
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Devices Mounted in the OP
Vol.50