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.
1 V t defines the voltage at which a MOS transistor begins to conduct. For voltages less than V t (threshold voltage), the channel is cut off.  In normal operation, a positive voltage applied between source and drain (V ds ).