| Bias (electrical Engineering) |
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# A systematic deviation of a value from a reference value. # The amount by which the average of a Set of values departs from a reference value. # Electrical, mechanical, magnetic, or other force ( Field ) applied to a device to establish a reference level to operate the device. # In Telegraph Signaling systems, the development of a positive or negative DC Voltage at a point on a Line that should remain at a specified Reference Level , such as zero. Note: :(Source: from Federal Standard 1037C and from MIL-STD-188 ) Most often, bias simply refers to a fixed DC voltage applied to the same point in a Circuit as an AC signal, frequently to select the desired operating response of a semiconductor (forward or reverse bias). For example, a bias Voltage is applied to a Transistor in an Electronic Amplifier to allow the transistor to operate in a particular region of its Transconductance curve. Bias is also the term used for a high-frequency signal added to the Audio signal recorded on Magnetic Tape . See Tape Bias . Bias is used in Direct Broadcast Satellite s such as DirecTV and Dish Network , the IRD box actually powers the Feedhorn or LNB Receiver mounted on the dish arm. This bias is changed from a lower voltage to a higher voltage to select the Polarization of the LNB, so that it receives signals that are polarized either Clockwise or Counterclockwise , thereby allowing it to receive twice as many Channels . |
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