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搜集的意思科技英语(电子与信息工程类)翻译

作者:高考题库网
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2021-01-19 15:30
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虚心使人进步骄傲使人落后-家乡的风俗

2021年1月19日发(作者:孙润华)

such,every new version of the product requires a redesign and
trips through the foundry,an expensive proposition,and an impediment
to rapid time-to-market.
而且,
每次推出一个新产品都需 要重新设计并
经历所有制造流程。这样做不但造价昂贵,而且不利于迅速上市。


e of the very high open -loop voltage gain of the op-amp,the
output
is
driven
into
positive
saturation(close
to+V)when
the
sample
voltage
goes
slightly
above
the
reference
voltage
,and
driven
into
negative
saturation
(close
to
-V)when
the
sample
voltage
goes
slightly
below the reference voltage .
由于运放的开环电压增益很高,
当取样电
压略高于参考电压时,输出趋向于正向饱和状态(接近
+V

。当取样
电压低于参考电压时,输出趋向于负向饱和状态(接近
-V





N-type
and
P-type
semiconductors
are
made
by
treated
materials,such as germanium and silicon with impurities such as arsenic
and indium.N
型半导体和
P
型半导体是利用杂质掺入纯净半导体 而形
成的,如将杂质砷和铟掺入锗和硅中。



comparison,most
other
forms
of
transmission
systems
convey
the
message
information
using
the
shape,or
level
of
the
transmitted
signal;parameters
that
are
most
easily
affected
by
the
noise
and
attenuation introduced by the transmission path.
相比之下,
许 多其他形
式的传输系统是利用被传信号的波形或电平的高低来传送信息的,

这些参数 又极易受到传输路径中的噪声和衰耗的影响。



11. Digital transmission system-embodied by telegraph systems- were
developed
in
the
1850s
before
analog
systems-the
telephone-in
the
twentieth
century .
以电报为代表的数字传输系统研发于
19
世纪
50

代, 早于以电话为代表的模拟系统,它是
20
世纪才开发的。


ing on the relationship between the signal frequencies and
the
sampling
rate,spectral
inversion
may
cause
the
shape
of
the
spectrum in the baseband to be inverted from the true spectrum of the
signal.
根据信号频率和采样频率之间的关系的不同,可能出现“频谱
反转”现象—基带频谱的形状和信 号真实频谱的形状正好相反。



element
has
a
separate
identity
of
its
own,thatis,no
two
elements
have
the
same
physical
and
chemical
properties,nor
can
an
element
be
subdivided
by
ordinary
physical
and
chemical
means
into
simple
element.
每一种元素均有它自己的标识, 也就是说,没有两个
元素具有相同的物理和化学特性,
一种元素也不能以普通的物理或化
学方法被分为两种简单的元素。


ns
whirl
around
nuclei
in
much
the
same
manner
that
the
planets of our solar system travel around the difference between
an atom of one element and that of another is in the number of protons
and neutrons contained in the nucleus.
电子围绕原子核旋转,其方式类
似于太阳系中行星围绕太阳旋转。
一种元素的原子和另一种元素的原
子的 差别在于其原子核中的质子数和中子数。



rmore,we
shall
prove
that
a
minimum
theoretical
sampling
frequency
of
order
6.8
kilohertz(kHz)is
required
to
convey
a
voice
channel occupying the range 300 Hz to 3.4 kHz.
而且我们将证明,
为了变
换频率范围为
300Hz~3.4kHz
的 话路信号,理论上的最小采样频率为
6.8kHz



example,the signal received from a satellite,located in far outer
space,is very weak and is at a level only slightly above that of the noise.
例如,
从位于遥远太空中的卫星接收到的信号极其微弱,
其电平 仅比
噪声稍高一点。


r,for
applications
in
which
the
end
product
must
process
answers
in
real
time,or
must
do
so
while
powered
by
consumer
batteries,GPPs
comparatively
poor
real
time
performance
and
high
power consumption all but rules them out.
然而,在最终产品必须实 时
响应的应用中,
或者必须在电池供电下实现实时响应的应用中,
由于
GPP
实时性能较差、功耗大、因此就被排除在外了。


raded
circuits
are
also
classified
according
to
their
l or logical IC are used as switches,they are either on or
computers the on and off states correspond to 0 or IC is
called linear or analog IC.
也可根据其功能不同 对集成电路进行分类。
数字
IC
(也称为逻辑
IC
)通常用作开关, 表示接通或关断。在计算机
中,接通和关断状态分别对应“
0
”或“
1

。另一种
IC
被称为线性或
模拟
IC




addition,the
signal
processor
may
also
add
parity
bits
to
the
digital
word
to
provide
channel
coding
so
that
error
detection
and
correction can be used by the signal processor in the receiver to reduce
or eliminate bit errors that are caused by noise in the channel.
此外,信
号处理器还可以给数码字加入奇偶校验位,
即提供信道编码,
使得接
收机的信号处理器可以进行误码检测和纠错,
以减少或消除由信道噪
声所引起的误码。



these
descriptions
we
shall
see
how
a
speech
channel
of
telephone quality maybe conveyed as a series of amplitude valuse,each
value being represented,thatis,coded,as a sequence of 8 binary digits.

这些讨论中,
我们会 看到话路中的语音信号是如何转换成一个幅值序
列的,而每个幅值又被编码,即以
8
位 二进制数的序列表示。



a
universal
microprocessor
solution
existed
with
which
every
design
could
realized,the
electronics
industry
wouldn't
be
a
very
competitive
place.
假如存在可用以实现任何设计的通用微处理器的话,
电子行业就不会竞争 得如此激烈了。


20.
In
digital
communication
systems,the
modulating
signal(e.g.,message)may be represented as a time sequence of symbols
or pulses,where each symbol has m finite symbol represents
n bits of information ,where n=log2 m bits/symbol.
在数字 通信系统中,
调制信号(比如消息)用符号或者脉冲的时间序列来表示,每一个符
号有
m
个有限状态。每个符号表示
n
比特的信息,这里
n=log2 m


/
符号。


ity is a measure of power per unit area,and even a laser that
emits
only
a
few
milli- watts
can
produce
a
lot
of
intensity
in
a
beam
that's only a millimeter in diameter.
强度是每单位面积上能量的度量,< br>即使一个仅产生几毫瓦能量的激光器也能产生一个直径只有
1
毫米
的高强度光束 。


beams have been produced in every color of the rainbow(red
is
the
most
common
laser
color),as
well
as
in
many
kinds
of
invisible
light,but each laser can emit one color and one color only.
激光束可以是
彩虹中的每一种颜色(红色是最常见的激光颜色 )
,还可以是许多种
看不见的光,但每个激光器能且只能发出一种颜色的光。


different schemes for performing these three function have
evolved during recent years,and we shall describe the main ones.
近年来,
人们对这三个环节的实现提出了许多不同的方案,
我们将对其中一些
主要的方案进行讨 论。


code radio transmission is an example of this technique.

尔斯码无线传输就是这种调制技术应用的一个实例。


the other hand ,a DC negative-logic system ,as in Figure 3.6(b),is
one which designates the more negative voltage state of the bit as the
1level and the more positive as the 0 level .
另一方面,如图
3.6
所示,
把比特的较低的电压状态 记为
1
电平,较高的电压状态记为
0
电平,
这样的系统称为直流负逻 辑系统。


way of creating fusion here on earth is to heat and compress
pellets containing hydrogen to the temperatures and pressures needed
to fuse the nuclei of the hydrogen atoms together,creating tiny hydrogen
bombs and thus generating incredible power.
在地球上实现核聚变的途
径是对含有氢气的气团加温加压,
以达到使氢原子核聚变的温度和压
力,制造小型氢弹,从而出现难以想象的巨大能量。



output
of
the
differential
amplifier

is

fed
to
the
circuit
's
output
stage

via
an
offset
-compensation
network
,which
causes
the
op- amp's output to center at zero output stage takes the form
of
a
complementary
emitter
follower,and
provides
a
low-impedance
output
.
差动放大级的输出通过一个 失调补偿网络与输出级相连,目
的是使运放的输出以
0V
为中心。输出级采用互补的射 极跟随器的形
式以使输出阻抗很低。


reduction in power dissipation is particularly important where a
complex circuit is to be concentrated into a small problem of
extracting the heat generated in the circuit may then be a difficult o ne.
减小功率损耗是非常重要的,
其方法是将一个复杂的电子线路集成为
一小块。这 使得释放电路工作时产生的热量变成一个难题。


fundamental purpose of an electronic communication system is
to transfer information from one place to another.
电子通信系统的基本
作用是把信息从此地传送到彼地。

虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗


虚心使人进步骄傲使人落后-家乡的风俗



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