ISL35111 Datasheet, PDF (5/8 Pages) Intersil Corporation – 11.1Gb/s Driver

ISL35111
Typical Performance Characteristics (Continued)
Performance is measured using the test setup illustrated in Figure 2. The signal from the pattern generator is launched
into the chip evaluation board. The ISL35111 output signal is then visualized on a scope to determine signal integrity
parameters such as jitter.
FIGURE 3. ISL35111 10.3125Gbps OUTPUT; NO CHANNEL; PRBS-31
FIGURE 4. ISL35111 10.3125 GBPS OUTPUT AFTER A 22-INCH FR-408 TRACE, PRBS-31; DE-EMPHASIS 6
Operation
The ISL35111 is an advanced driver for high-speed
interconnects. A functional diagram of ISL35111 is
shown in Figure 5. In addition to a de-emphasis circuit to
compensate for FR4 channel loss and restore signal
fidelity, the ISL35111 contains unique integrated features
to preserve special signaling protocols typically broken by
other drivers. The signal detect function is used to mute
the channel output when the input signal falls below the
level determined by the Detection Threshold (DT) pin
voltage. This function is intended to preserve periods of
line silence.
As illustrated in Figure 5, the core of the high-speed
signal path in the ISL35111 is a sophisticated driver
followed by a de-emphasis circuit. The device applies
pre-distortion to compensate for skin loss, dielectric loss,
and impedance discontinuities in the transmission
channel.
IN[P]
IN[N]
DT
Limiting
Amplifier
Adjustable
De-Emphasis
Pre-
Driver
Output
Driver
Signal
Detector
FIGURE 5. FUNCTIONAL BLOCK DIAGRAM OF THE ISL35111
OUT[P]
OUT[N]
LOS
5
FN6975.0
November 19, 2009