Venu 210i User Guide V1.0
Page 17
6.7 Internal signal path polarity
In order to increase the power’s supply energy storage efficiency, signals coming from
channel pairs 1-2 are polarity reversed, one with respect to the other within the pair, when
entering the amplifier. This ensures a symmetrical use of the voltage rails: if, for example,
both channels’ 1 and 2 input signals are going through a peak at the same time, channel 1’s
energy will come from the positive voltage rails while channel 2, whose polarity is reversed
with respect to channel 1, will be fed energy from the negative voltage rails. In this manner,
the power supply will work symmetrically, with one channel catered by the positive rails and
the other by the symmetrical negative rails. Channel 2’s signal will be polarity reversed once
more to ensure that both channels output with the same polarity as their corresponding
input signals.
For this reason it is very important not to invert the polarity of either channels before feeding
them to the module. A double polarity inversion (the first by the user inserting the input signal
and the other by the amplifier’s internal circuitry) results in no inversion at all. If this were the
case, both channels would be weighing on only one side (positive or negative) of the power
supply’s voltage rails. This would result in an inefficient use of the power supply’s energy.
Please pay special attention in using balanced inputs on all measurement equipment (such as
oscilloscope probes) when you are bench testing.
Figure 6.5: Internal signal path polarity with example input signal.
Both channels 1 and 2 are fed with the sma sine signal.
6 Venu 210i DSP
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