Figure 3-1: Output Optimized for Waveform
Symmetry,
L=8.2nH, R=75Ω
(Typical ORL=13.5dB)
Figure 3-2: Output Optimized for Return Loss, L=12nH,
C=0.5pF,
R=75Ω
(Typical ORL=18dB)
and
show the eye diagram of the GS1508 output for two different
output compensation conditions.
shows the GS1508 output optimized for wideband return loss of 18dB.
shows the GS1508 output optimized for output waveform symmetry. In this
case, the output may not exhibit a return loss of 15dB.
When measuring return loss at the GS1508 output, it is necessary to take the
measurement for both a logic HIGH and a logic LOW output condition. This is because
the output protection diodes act as varactors (voltage controlled capacitor), as shown in
Consequently, the output capacitance of the GS1508 is dependent on the logic state of
the output.
GS1508 HD-LINX™ HDTV Cable Driver
Data Sheet
9500 - 6
August 2010
6 of 14
GENNUM [ GENNUM CORPORATION ]
