bias voltage


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Related to bias voltage: bias current, Quiescent point, operating point

bias voltage

[′bī·əs ‚vōl·tij]
(electronics)
A voltage applied or developed between two electrodes as a bias.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bias

(1) A weight given to a neuron in a neural network. See neuron.

(2) A voltage applied to the gate (or base) of a transistor or vacuum tube, which causes the device to operate in its conductive state. When the control voltage (input voltage) is applied to the gate, it is added to the bias, causing the resultant voltage to be higher or lower, based on the sum of the two.

Forward and Reverse Bias
Forward bias voltage brings the transistor or tube into or closer to its conductive state. For example, if the gate requires positive voltage to conduct, forward biasing adds positive voltage.

In contrast, reverse bias holds the device in a non-conductive state until the sum of the control voltage and bias is sufficient to bring it to the conductive state. For example, if the gate requires positive voltage to conduct, reverse biasing adds negative voltage.

Bias is widely used in analog devices, such as an audio amplifier, to keep the input voltage within the conductive region of the transistor or tube. It is also used in digital circuits to reach a certain threshold and open or close the switch faster.


Transistor Conduction Curve
This is the typical conduction curve of a bipolar and field effect transistor (FET). A forward bias pushes the voltage past the transition region and keeps the transistor operating in its conduction region.
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References in periodicals archive ?
VCO voltage swing is lying between 0 volt and the supply voltage level, but it is assumed that when the bias voltage [V.sub.b] is low, the differential VCO frequency is not controlled by the control voltage [V.sub.c].
Load resistance is 1 k[ohm] and bias voltages ([V.sub.B]) of the NMOS and PMOS structures are 0.65 V and 0.57 V respectively.
In Figure 2, capacitance-voltage measurement shows that the average capacitance change of all samples for 50V47 [micro] F decreases dramatically with the bias voltage increasing.
Figure 7 shows the leakage current as a function of the bias voltage obtained from the Sb[I.sub.3] detectors.
All measurement results are given for the gate area S = [10.sup.-2] [cm.sup.2]; the positive values of the bias voltage V correspond to the positive potential at the metal gates with respect to the substrates.
With a bias voltage of 0 V or 30 V for LC, the designed metasurface structure works in the "ON" or "OFF" state like a switch at a certain frequency.
[V.sub.REF1] and [V.sub.REF2] represent the two reference voltages for adjusting the bias voltages in operational amplifiers OP1 and OP2.
Low voltage dropout is secured by use of an external bias voltage pin (VBIAS), which helps to improve system power efficiency and contributes to longer charge life for the batteries of mobile products.
A fixed bias voltage is applied to the electrodes, so the amount of current that can flow is related to the amount of PM that has deposited.
To evaluate the heterojunction parameters by TE theory, the n value was computed from the slope of the linear part obtained from the plot of ln J versus V, while the value was computed from the [J.sub.0] value computed from the straight line intercept of the ln J-V at an applied bias voltage of 0 V.
The duty of the control chip is to deliver different bias voltage to corresponding chip by following instructions from command computer.
In AFM images, the DC bias voltage applied an electric field, which is capable of rotating the orientation of the polarization.