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dc bias是什么意思
中文翻译百科解释直流偏压直流偏置:&&&& DC, D. C. ＝ 1.direct c ...:&&&&vt. (biased, biasing 〔英国〕 bi ...:&&&&直流偏移:&&&&直流偏压控制:&&&&直流偏置调整:&&&&直流磁偏; 直流偏磁:&&&&阴极偏压直流分量恢复电路:&&&&n. 1.成见，先入之见，偏执，偏见 (opp. Imp ...详细百科解释
例句与用法Greatly different from previous works , the matching circuits and dc bias networks are bent many times , for minimizing the lna与以往同类工作有很大不同，为了实现lna小型化的目的，对匹配电路和直流偏置网络采用多次曲折线的形式。 Moreover , the microstrip - waveguide transition and the circuit for dc bias in the vco are analyzed , and the analysis is generally useful for design of millimeter - wave planar circuit最终,在微带线上制成了w频段平面集成体效应管压控振荡器,并进行了测试。 A tunability of 60 % and figure of merit of 133 have been achieved under 30v dc bias , demonstrating their usefulness for frequency - agile microwave devices at the liquid nitrogen temperature在液氮温区表现出很好的微波器件应用前景。 4 、采用pld方法制备了高凰100 )取向的bao . ssr05五o创51卿si集成薄膜。 Device degradation behaviors of typical - sized n - type metal induced lateral crystallized polycrystalline silicon thin film transistors were investigated under two kinds of dc bias stresses : hot carrier stress and self - heating stress本文主要研究了典型尺寸的n型金属诱导横向结晶多晶硅薄膜晶体管在两种常见的直流应力偏置下的退化现象:热载流子退化和自加热退化。 Also , cathode bias circuits ( with bypass capacitors ) are not very successful , since for dc bias purposes , the cathode resistor presents a high dc resistance equivalent at the anode , and the quiescent point is not very stable而且，阴极偏压电路（带旁路电容）也很难成功，因为直流偏压的原因，阴极电阻在屏级上表现出很高的等效直流电阻，这样静态工作点很难得以稳定。 The low insertion loss is achieved by optimizing the transistor widths and bias voltages , by minimizing the substrate resistances , and by dc biasing the transmit and receive nodes , which decreases the capacitances while increasing the p1db通过优化mosfet的栅宽及偏置电压可以降低插入损耗。在版图设计中通过增加衬底接触降低衬底电阻,从而减小插入损耗。另外,为接收和发送端提供直流偏置可以降低p1db 。 A driving signal with a dc bias voltage and ac voltage is usually necessary for sensing very small capacitance . the reliable operation conditions of the capacitive sensor for foreign acceleration had been researched with the assumption of the parallel comb plates . but the comb plates are actually not parallel for the reason of the drie process前人在研究外界加速度信号对传感器的作用时，假定驱动信号产生的静电力作用在平行梳齿电容极板上，但是，在用drie工艺对硅进行刻蚀时会产生侧蚀效应，从而得到的梳齿电容有一定的倾斜角度。 In the simulation work , one 1 . 5kw and one 18kw induction motors ? control system were simulated and two simplified control scheme were proposed . when developing the program in tms320f240 dsp , this paper solved two practical problems : the finite - length effect and dc bias effect . finally , sensorless control system based on adaptive filter theory are tested on the platform of 1 . 5kw induction motor , the results show that the scheme ? performance is good在仿真过程中，针对1 . 5kw和18kw异步电机进行了仿真，并在此基础上提出两种简化控制方式；在tms320f240的具体编程过程中，分别对自适应滤波器的有限字长效应、直流偏置效应等非理想因素进行了修正和补偿；最后，在1 . 5kw微型异步电机上进行了转矩闭环无速度传感器实验，实验结果表明了算法完全可以达到预期的目标。 &&
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The dielectric constant decreased significantly under large DC bias level.
在较大的直流偏压场下，介电常数大幅度降低。
The dielectric nonlinearity of the PMN-PZN-PT relaxor ferroelectric ceramics under DC bias was investigated.
在一定温度范围内，对PMN-PZN-PT系弛豫铁电陶瓷直流偏压下的介电非线性进行了研究。
Abstract: Powder core has high saturation flux density and excellent motion linearity of DC bias.
摘要：磁粉心具有较高的饱和磁通密度和较好的直流偏磁动态线性。
It is the key problem for studying the exciting current in the transformer under DC bias magnetization.
在直流偏磁条件下变压器励磁电流是研究变压器直流偏磁特性的关键。
In this paper, it is explored that DC bias field induces SLFE material’s active piezoelectricity.
在利用偏置电场诱导细电滞回线材料的压电活性方面，本文进行了探索性的研究。
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相关词典网站：From Wikipedia, the free encyclopedia
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by . Unsourced material may be challenged and removed. (August 2012) ()
When describing a
in the , the DC bias, DC component, DC offset, or DC coefficient is the
value of the . If the mean amplitude is zero, there is no DC offset. A waveform without a DC component is known as a DC-balanced or DC-free waveform.
The term originated in electronics, where it refers to a
voltage. In contrast, various other non-DC frequencies are analogous to superimposed
(AC) voltages or currents, hence called AC components or AC coefficients.
The concept has been extended to any representation of a
and to two-dimensional transformations like the
DC offset is usually undesirable when it causes
or other undesirable change in the operating point of an amplifier. An electrical DC bias will thus a simple
can be used to block or remove it, leaving only the AC component on the other side. In signal processing terms, DC offset can be reduced in real-time by a . For stored digital signals, subtracting the mean amplitude from each sample will remove the offset. Very low frequencies can look like DC bias but are called "slowly changing DC" or "baseline wander".
DC-balanced signals are used in communications systems to prevent bit errors when passing through circuits with
or . Bit errors can occur when a series of 1's create a DC level that charges the capacitor of the high-pass filter used as the AC coupler, bringing the signal input down incorrectly to a 0-level. In order to avoid these kinds of bit errors, most
are designed to produce DC-balanced waveforms. The most common classes of DC balanced line codes are
In audio recording, a DC offset is an undesirable characteristic of a recording sound. It occurs in the capturing of sound, before it reaches the recorder, and is normally caused by defective or low-quality equipment. The offset causes the center of the recording waveform to not be at 0, but at a higher or lower value, for example, +1 or -1. This can cause two main problems. Either the loudest parts of the signal will be clipped prematurely, since the base of the waveform has been moved up, or inaudible low-frequency distortion will occur. Low-frequency distortion may not be audible in the initial recording, but if the waveform is resampled to a compressed or lossy digital format, such as an MP3, those corruptions may become audible.
was used in early tape recorders to reduce distortion.
A DC bias is applied to the control grid of
in order to regulate power.
can be used to power microphones or other devices over the same wires as required for the signal. This is commonly used, for example, in professional audio .
On modern , used for
, a DC bias is used to provide
to the . Changing the bias between approximately 12 and 18 volts also allows selection of the correct
(horizontal and vertical on older systems,
and counterclockwise on newer
(VCO), such as in a , selection of the
is done with a DC bias. For
(FM), the AC component is the
plus any .
can be done solely by changing the DC bias.
The , which is normally
AC, can be severely disrupted by the presence of a large DC bias. This is caused by strong
hitting the 's , which in turn creates strong . This
voltages in long-distance electrical lines, which can be strong enough to
across transformers. (Even , such as the mostly above-ground , are prone to this, and must be tied to
.) This is a rare but serious problem, mostly for far northern locations like
and , where a strong
will cover much lower
than normal during such a situation.
are used to predict when these
events might occur.
systems have their own control gear at
stations and can adapt somewhat better to such conditions. However, large and often widely fluctuating voltages can still cause problems like .
(March 1997).
(PDF). IEEE Transactions on Communications. 45 (3): 293–299. :. The dc-balanced or dc-free codes, as they are often called, have a long history and their application is certainly not confined to recording practice.
Randall Aiken. . .[]
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