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GS2984 数据表(PDF) 11 Page - Semtech Corporation

部件名 GS2984
功能描述  Adaptive Cable Equalizer
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

GS2984 数据表(HTML) 11 Page - Semtech Corporation

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GS2984 Adaptive Cable Equalizer
Data Sheet
50985 - 3
March 2010
11 of 20
4.2 Cable Equalization
The input signal passes through a variable gain equalizing stage, whose frequency
response closely matches the inverse of the cable loss characteristic. In addition, the
variation of the frequency response with control voltage imitates the variation of the
inverse cable loss characteristic with cable length.
The edge energy of the equalized signal is monitored by a detector circuit which
produces an error signal corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is integrated by both an internal and
an external AGC filter capacitor providing a steady control voltage for the gain stage. As
the frequency response of the gain stage is automatically varied by the application of
negative feedback, the edge energy of the equalized signal is kept at a constant level
which is representative of the original edge energy at the transmitter. The equalized
signal is also DC restored, effectively restoring the logic threshold of the equalized signal
to its correct level independent of shifts due to AC coupling.
4.3 Serial Digital Outputs
The digital output signals have a nominal voltage of 800mVpp differential, or 400mVpp
single-ended when terminated with 50Ω as shown in Figure 4-1.
Figure 4-1: Typical Output Voltage Levels (for 3.3V Common Mode)
50
50
SDO
SDO
+200mV
-200mV
VCM = 2.9V
typical
+200mV
-200mV
VCM = 2.9V
typical


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