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Description: 三点式振荡器是指LC回路的三个端点与晶体管的三个电极分别连接而成的电路，如图4-1（a）所示。图中三个电抗元件X1、X2、X3构成了决定振荡频率的并联谐振回路，同时也构成了正反馈所需的反馈网络。从相位条件看，要构成振荡器，必须满足： (1)极相连的两个电抗X1、X2性质相同。 (2)X1与X2、X3的电抗性质相反。-three-point refers to LC oscillator circuit with three transistors endpoint of three electrodes were connected with the circuit, Figure 4-1 (a) below. Figure 3 reactor components X1, X2, X3 decision constitutes a frequency of the oscillation parallel resonant circuit, but also constitutes a positive feedback for the feedback network. From Phase conditions, to constitute an oscillator, to be met : (a) very connected to the two reactor X1, X2 the same nature. (2) X1 and X2, X3 nature of the resistance -- contrary.
Platform: |
Size: 16081 |
Author: 张枫 |
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Description: 三点式振荡器是指LC回路的三个端点与晶体管的三个电极分别连接而成的电路，如图4-1（a）所示。图中三个电抗元件X1、X2、X3构成了决定振荡频率的并联谐振回路，同时也构成了正反馈所需的反馈网络。从相位条件看，要构成振荡器，必须满足： (1)极相连的两个电抗X1、X2性质相同。 (2)X1与X2、X3的电抗性质相反。-three-point refers to LC oscillator circuit with three transistors endpoint of three electrodes were connected with the circuit, Figure 4-1 (a) below. Figure 3 reactor components X1, X2, X3 decision constitutes a frequency of the oscillation parallel resonant circuit, but also constitutes a positive feedback for the feedback network. From Phase conditions, to constitute an oscillator, to be met : (a) very connected to the two reactor X1, X2 the same nature. (2) X1 and X2, X3 nature of the resistance-- contrary.
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Size: 15360 |
Author: 张枫 |
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Description: 该文借助振动信号模型直观地阐明瞬时频率的物理意义 引出固有模态的概念及其应满足的条件。
-The model with vibration signals directly to clarify the physical meaning of instantaneous frequency leads to the concept of intrinsic mode and its conditions should be met.
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Size: 71680 |
Author: 齐磊 |
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Description: 常规的单载波调制技术在带宽有限的测井电缆上的低传输速率制约着成像测井技术的发展。在分析测井
电缆传输特性和 OFDM 技术原理的基础上 ,设计了一种基于 OFDM 技术的测井电缆高速数据传输系统 ,并介绍了
基于 OFDM 技术的测井电缆高速数据传输系统的参数设计和工作原理 ,给出了不同长度测井电缆上的测试结果。
电缆实测结果表明 ,在 7 000 m长的测井电缆上 ,基于OFDM 技术的测井电缆高速数据传输系统可获得900 kbit / s
以上的数据传输速率和低于 5E28 的误码率。当变压器的接入模式为 Mode2II时 ,系统最高的数据传输速率可达到
1. 1 Mbit/ s。-To solve t he low data t ransmission rate problem in t he conventional single car rier mod2
ulation met hod for logging cable and enhance t he data t ransmission rate , a new data t ransmission
system with high data t ransmission rate for logging cable is propo sed , which is based on t he Or2
t hogonal Frequency Division Multiplexing (OFDM) technology. The working principle of OFDM
modem and t he procedure of data t ransmission system are al so presented and lot s of test s are car2
ried out on logging cables with different lengt hs. It is verified that t he data t ransmission rate can
reach 900 kbit/s on 7 000 meter s logging cable wit h bit er ror rate (BER) lower t han 5E28 , and
t he maximum data t ransmission rate is 1. 1 Mbit/s under Mode2II of t he t ransformer .
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Size: 325632 |
Author: 秦赵真 |
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Description: Frequency meter Verilog implementation for Xilinx XC2C256. MT10T7 7-seg LCD used for output.
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Size: 667648 |
Author: Nick |
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Description: 基于AT89S52和LCD1602的简单数字频率计，测量范围在0.2Hz到500kHZ之间，精度随频率有所变化。压缩包内包含Keil环境下的C语言源代码，以及Proteus仿真文件-Based on AT89S52 and LCD1602 a simple digital frequency meter to measure the range of 0.2Hz to 500kHZ between the precision with frequency change. Compressed package contains Keil environment, C-language source code, as well as the Proteus simulation file
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Size: 56320 |
Author: chh513 |
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Description: frequency meter using micro controler
file content:
c code to program ATMEL microcontrolers
simulation circuit in proteus
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Size: 62464 |
Author: Niao |
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Description: Frequency response of Multimode (MM) fibers
beyond the baseband is studied both theoretically and
experimentally. It is shown that in the absence of mode group
mixing there are relative flat passbands suitable for transmission
in such fibers if the number of mode groups propagating is not
too large. Such conditions are usually met for typical
contemporary graded index (GI) silica fibers. It is also proved
that the passbands width is related to the baseband width.
Moreover, the 1300 nm window is the most suitable for
transmission due to small chromatic dispersion and reduced
number of mode groups propagating.
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Size: 647168 |
Author: serag |
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Description: 10-b 50-MHz digital-to-analog (D/A) converter is presented
which is based on a dual-ladder resistor string. This approach
allows the linearity requirements to be met without the need for selection
or trimming. The D/A decoding scheme reduces the glitch energy, and
signal-dependent switch signals reduce high-frequency distortion. The
output buffer allows driving 1 V,,, to 75 Cl
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Size: 506880 |
Author: john |
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Description: 本EA属于趋势类高频刷单系统，也是目前最常见最成熟的类型。能根据市场行情和预先设定好的策略来进行入场操作，只要符合开仓/平仓条件就会立即开仓/平仓操作。该EA为高频交易类型，会有很高的回报率，使用者在实盘交易前需要熟悉EA的使用方法和风险。(This EA belongs to trend type high frequency brushing system, and is also the most common and mature type at present. Entry operation can be carried out according to market quotations and pre-determined strategies. As long as the opening/closing conditions are met, the opening/closing operation will be carried out immediately. The EA is a high-frequency trading type, which will have a high rate of return. Users need to be familiar with the use of EA and its risks before trading.)
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Size: 243712 |
Author: 指引者 NO 1 |
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