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The article discloses a differential amplifier circuit in which opposed transistors operate in switching, linear or mixed linear/switching modes to adaptively compensate for skin effect losses in cables
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
67% of the total text.
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Adaptive Equalization Circuit
The article discloses a differential amplifier circuit in which opposed
transistors operate in switching, linear or mixed linear/switching modes to
adaptively compensate for skin effect losses in cables
In data transmission systems using coaxial or twisted pair cables, the
transmitted signal is attenuated due to the skin effect loss in the cable. The loss
is a direct function of frequency. For broadband signals, communication
becomes difficult without equalization, i.e., compensation for this frequency-
This article relates to a particularly simple dynamic equalizer for use in serial
high-speed data communication systems.
The circuit diagram of the new equalizer is shown in Fig. 1. It is basically a
differential amplifier and, as such, has two basic operating modes: linear and
switching. When the input signal, Vin, is small, transistors Q1 and Q2 operate in
the linear mode, and the simplified small signal equivalent circuit as shown in Fig.
2 is valid. The small signal transfer function is approximately equal to the
following. G(jOmega) = (Rc gm) over 2 (1 over 1 gm R1) (jOmega a) over
JOmega b) where a = 1 over Ce R2 and b = 1 over Ce R2 (1 R2 over R1).
Fig. 3 shows the magnitude plot of G(jOmega). By choosing R1, R2 and Ce
appropriately, the equalizer can be designed to compensate for skin effect for
any specified maximum cable length.
When the same equalizer is used with a cable of less-than-maximum length,