The high frequency modulation characteristics of GaAs-GaAlAs DH LBDs are analyzed and the results (data and curves) presented.
分析了器件的两种高频调制特性，给出了测量结果——数据和曲线。
The small signal analysis for high frequency modulation characteristics of specific wavelength laser diode with narrowband filter was presented.
采用窄带滤光片作为选频元件对精确波长激光器高频调制特性进行了小信号分析。
In the receiver, through the appropriate RC or LC network can filter out square wave and high frequency modulation signal for simulating the reduction form.
在接收端，通过适当的RC或LC网络可以滤除调制高频方波并将信号还原为模拟形式。
The phenomenon that the effect of the high frequency modulation is better than that of the low frequency modulation is explained, and general rules of choosing modulator parameters are also presented.
解释了高频调制效果比低频调制好的实验现象，并且给出了确定调制器参数的一般原则。
High frequency pulse width modulation power control systems can be realized using semiconductor switches.
高频脉冲宽度调制电力控制系统，可以实现用半导体开关。
OFDM (Orthogonal Frequency Division Multiplexing) is a new modulation technology, it is suitable to high-data-rate transmission in the wireless transfer channel with multi-path transmission.
正交频分复用(OFDM)是一种新型调制技术，特别适合在多径传播的无线移动信道中高速传输数据。
Chirp signal is a kind of pulse-compressed signal with large time-bandwidth products achieved through linear frequency modulation. It has high resolution in range because of its great bandwidth.
线性调频信号是通过线性频率调制获得大的时宽带宽积的一种脉冲压缩信号，具有大的带宽，因此有高的距离分辨力。
This thesis introduces a series of low cost high precision Linear Frequency Modulation Continuous Wave (LFMCW) ranging radar.
本文介绍一种低成本、高精度线性调频连续波(LFMCW)测距雷达。
A novel drive system with high frequency AC pulse density modulation for electric vehicles is proposed, and its operation principle and control method are studied in detail.
提出了一种用于电动汽车的高频交流脉冲密度驱动系统并阐述了系统的工作原理和控制方法。
The remote control device crystal frequency stabilization using pulse amplitude modulation transmitter, A simpler circuit, high frequency stability, launched 28MHZ are continuous carrier amplitude.
该遥控装置采用晶体稳频脉冲调幅发射机，电路较简单，频率稳定度高，发射的是间断的28MHZ等幅载波。
Quantum well laser diodes are of high modulation frequency response. They can be used as light sources and be directly modulated for high bit rate optical communications.
量子阱激光器具有良好的小信号调制频率响应，能作为高速光通信光源采用直接调制方式进行信号传输。
The system can be used to measure the voltage responsivity and detectivity of infrared detector at different modulation frequency with rapid speed and high accuracy, it meets the need of measurement.
该系统可以自动测试不同调制频率下红外探测器的电压响应率和探测率，能够快速准确地完成测试任务，满足了测试要求。
A novel adaptive line enhancer (ALE) with high frequency resolution was presented, which suitable for underwater acoustic communication with MFSK or frequency hopping (FH) modulation.
根据水声mfsk或跳频通信中频率估计特点，提出了一种基于自适应线谱增强器(ale)理论的实用高分辨频率估计新方法。
However, Pulse Width Modulation (PWM) which was input from inverter is characterized by steep rising edge and high frequency, resulting in the too early failure of motor insulation.
然而，逆变器输出的PWM(脉冲宽度调制)连续高压脉冲的上升沿很陡、频率很高，导致在脉冲电压下牵引电机绝缘过早失效。
Any subtle change of capacitance can be measured through the method of modulation on high-frequency harmonic oscillation return circuit.
电容的微小变化可通过对高频谐振回路调制的方法进行测量。
Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed.
由于高速数据占用更宽的带宽，所以在调制制式上应该寻找一种适合于跳频通信特点的具有高频谱效率的调制方案。
A single carrier modulation scheme suitable for use in high frequency communication systems is provided that achieves improved residual frequency error and phase noise estimation.
提供了一种实现改进残留频率误差和相位噪声估算的、适合于在高频通信系统中使用的单载波调制方案。
A novel topologic structure of high frequency AC pulse density modulation converter is proposed, and its operation principle, control scheme and design are described in detail.
提出了一种新颖的高频交流脉冲密度调制变频器的拓扑结构，并详细阐述了工作原理、控制方案和设计方法。
Modulation is the process of loading the information to be delivered onto a certain(signal carrier) signal of high frequency.
调制是将要传送的信息装载到某一高频（载波）信号上去的过程。
It operates both in current mode at high output load and in pulse frequency modulation (PFM) at light load to reduce the power dissipation.
它在重载下工作于电流控制模式，轻载下工作于脉冲频率调制(PF M)模式来降低功耗。
In this paper, the measurement method of high frequency brightness modulation laser phase for mechanic surface microcosmic appearance is given out.
提出了用高频光强调制、同源频率合成、软件鉴相的激光相位微距测量方法测量表面微观轮廓高度。
The master control chip uses AT89C51, the communication mode adopts DTMF signal with strong anti-interference and high reliability, and simplex frequency modulation.
主控芯片采用AT89C51单片机，通信方式采用抗干扰能力强、可靠性高的DTMF信号和单工调频的无线通信方式。
Broadband noise frequency modulation signal with high precision is commonly used in modern electronic interference system.
宽带高精度的噪声调频信号在现代电子干扰系统中应用广泛。
On the basis of the principle of range-Doppler coupling of linear frequency modulation signal, a new method of radial velocity estimation for high coupling coefficient is presented.
本文在分析了线性调频信号距离—多普勒耦合原理的基础上，提出了一种高耦合系数条件下径向速度估计的新方法。
In some embodiments, the converter has a third sub-mode (' high output power sub-mode '), in which pulse width modulation is used but the switching frequency is fixed at a second frequency.
在某些实施例中，转换器具有第三子模式(“高输出功率子模式”)，其中使用脉冲宽度调制，但开关频率固定在第二频率。
Nowadays, the mainstream of far field beam smoothing technology adopted by foreign high power laser drivers is smoothing by spectral dispersion (SSD) based upon sinusoidal frequency modulation.
目前，国外高功率激光驱动器实现远场分布平滑化的主流技术是基于正弦调频脉冲的光谱色散平滑技术(SSD)。
Adopt high frequency multi voltage circuit, PWM pulse width modulation technology and high-power IGBT devices.
采用高频倍压电路，应用PW M脉宽调制技术和大功率IGBT器件。
The high-frequency modulation reference light and the optical signal to be tested are reflected to the photoelectric sensor by a semi-permeable semi-reflector.
高频调制参考光和被测光信号是通过半透半反光镜照 射到光电传感器上。
The frequency changer velocity modulation technology is technology and so on collection automatic control, micro electron, electric power electron, correspondence to a body high tech technology.
变频器调速技术是集自动控制、微电子、电力电子、通信等技术于一体的高科技技术。
The frequency changer velocity modulation technology is technology and so on collection automatic control, micro electron, electric power electron, correspondence to a body high tech technology.
变频器调速技术是集自动控制、微电子、电力电子、通信等技术于一体的高科技技术。
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