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Application Notes
How a balanced circuit differs from an unbalanced circuit
A balanced circuit has its electrical midpoint grounded. An unbalanced circuit, however, has one side grounded. A balanced circuit is typically used in communications equipment because a balanced circuit has the advantage of better spurious noise suppression.
Figure 1 shows a balanced cable which is an example of a balanced circuit. The voltages of the cable’s two conductors are at every point equal in amplitude and opposite in phase. Figure 2 shows an unbalanced cable which is an example of an unbalanced circuit. Most measurement circuits in the Keysight Technologies, Inc. impedance analyzers and LCR meters are unbalanced.
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