Certificates of deposit, or CDs, are fixed income investments that generally pay a set rate of interest over a fixed time period.
When referenced to the local common or ground, a common-mode signal appears on both lines of a two-wire cable, in-phase and with equal amplitudes. Technically, a common-mode voltage is one-half the vector sum of the voltages from each conductor of a balanced circuit to local ground or common.
A common-mode EMI signal appears on the two signal lines simultaneously in the same direction and phase. The signal on each line returns through a common ground. The solution, a common-mode choke, produces equal and opposite magnetic fields that cancel one another. A capacitor from each line to ground is also used.