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RFX2401一款高性能PA 用于蓝牙、WLAN、Zigbee和MIMO设计的两个高度集中单芯片及单芯片解决方案是首个RF前端集成电路(RFeICs)。RFX2401主要应用于蓝牙1级和单端口Zigbee。该芯片在BiCMOS器件中集成了功率放大器、LNA、发送和接收开关电路、相关匹配网络、以及谐波滤波器。
前端的优越性能、高灵敏度和效率、低噪音、小型化和低成本使其非常适用于需要扩展范围和带宽的应用，这种扩散可能是10x的。RFX2401具有集成功率检测电路，只需一个外接电源电容器和用
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VHDL实现谐波检测信号发生的DDS. 同时发出正弦波，三角波，正弦波2倍频后的方波。波形频率相位可调。-VHDL implementation of harmonic detection signal of the DDS. Also issued a sine wave, triangle wave, sine wave, after square-wave frequency 2. Phase adjustable frequency waveform.
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变频驱动主要使用的驱动波形主要有SPWM和SVPWM两种。SPWM原理简单、实现容易,是现在使用最广的一种变频驱动波形。但其有一个致命的弱点是其电源利用率不高（只有86％）、谐波成分大。因此,在新近开发的产品中其应用逐渐被性能优异的SVPWM所取代。SVPWM是一种电压利用率、低谐波成分的变频驱动波形,还有开关次数少、功率管功耗小等特点。同时,SVPWM还能很好的结合矢量控制算法、以最大限度的发挥设备的性能。因此被越来越多的变频设备所采用。-The main use of variable f
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Very Low Frequency (VLF) spectrograms show
sometimes sets of lines called MLR (Magnetospheric Line
Radiation) with frequency spacing close to 50 or 60 Hz. It is
very tempting to attribute these MLR to Power Line
Harmonic Radiation (PLHR). PLH
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利用MSPd30F149 单片机和AIM21电流环芯片，通过简单的压频转换(多谐振荡器)电路实现了基于电客式差压
传感器的智能差压变送器设计。该设计的特点是利用压频转换电路取代了A／D模块，以极低的产品价格达到了较高的
系统测量精度。采用软件与硬件相结合的信号处理技术，实现了基于HART协议现场总线技术的差压模拟量的测量，通
过进一步采用CPLD器件的量化延时测频技术，将可以达到比传统A／D器件更高的压力测量精度。智能差压变送器；HART协议现场总线；MSP430F149；AIM21
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恒频恒压(CVCF)逆变电源的输出电压波形质量是衡量其性能的重要指标之一。文章采用一种重复控制和双闭环控制相结合的电压波形控制策略，以重复控制器提高逆变电源输出电压的稳态精度，减小总谐波畸变率；以双闭环控制器达到较快的动态响应速度。该方案在一台采用TMS320F240 DSP控制芯片的50 Hz三相PWM逆变器上得到验证。-Constant voltage constant frequency (CVCF) Inverter output voltage waveform quality is
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Before starting, it is necessary to discuss some fundamentals that are important in
understanding analogue and digital transmission. The first area that is discussed is
what is meant by frequency. Also the make-up of complex waveforms such as
s
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Autocorrelation is the cross-correlation of a signal with itself. Informally, it is the similarity between observations as a function of the time separation between them. It is a mathematical tool for finding repeating patterns, such as the presence
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声频功率放大器的参数如下：
1.放音频率（-3dB 电平）的额定范围为25～22000HZ；
2.立体声道的有效功率为5.5W × 2；
3.低频道的有效功率为22W；
4.额定输入电压0.25V；
5.在额定输入电压时谐波系数为0.12％；
6.电压放大系数为26dB；
7.静态电流120mA～150mA；
8.电源电压为11.7～14.4V。-The acoustic parameters of the power amplifier is as follow
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INFLUENCE OF HARMONICS IN POWER FACTOR CORRECTION
Ha decades, the inclusion of non-linear loads in dustrial circuits has grown considerably due to the benefits provided by it, especially in motor drives. The main feature of these charges is t
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In this paper, an approach is presented which removes the Electrocardiographic (ECG) interference from the Electomyographic (EMG) signal. When the EMG signal is taken from some specific muscles, it often gets contaminated with the noise and ECG signa
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We demonstrate a new approach to CARS spectroscopy by effi ciently syn- thesizing synchronized narrow-bandwidth (less than 10 cm− 1) pump and Stokes pulses (frequency diff erence continuously tunable upto ～3000 cm− 1) based on spec
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基于小波变换和 HHT 的分布式并网系统谐波检测方法。
该方法利用小波变换多分辨率分析思想对信号进行划分，并对划分后的信号进行经验模态分解，得到一系列的经验模态函数IMF，并从 IMF分量中提取出基波分量和高次谐波；再对IMF分量进行Hilbert 变换得到信号的频率、幅值信息。-Wavelet transform and HHT based distributed systems and network harmonic detection method.
The method use
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提出了2种具有高电压传输比的新型矩阵变换器，根
据逆变侧主电路拓扑结构的不同，将其分别称为Boost 矩阵
变换器(BMC)和Buck-Boost矩阵变换器(BBMC)。介绍了这
2种拓扑结构的基本构成和工作原理，阐述了滑模控制器和
双闭环控制器的设计方法，并对其进行了比较，最后通过仿
真证明了该新型电路结构的可行性和有效性。结果表明：该
电路能实现电压传输比和输出频率的任意调节，且波形失真
度小，从而有效地解决了传统矩阵变换器(CMC)电压传输比
低的固有缺陷，
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EG8010 is a digital pure sine wave inverter ASIC (Application Specific Integrated Circuit) with
complete function of built-in dead time control. It applies to DC-DC-AC two stage power converter
system or DC-AC single stage low power frequency tra
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基于DDS和SOPC的谐波信号发射器，拥有可调节的频率，阶段和谐波比例的谐波信号发射器由本文所设计。-Based on DDS and SOPC harmonic signal transmitter, with adjustable frequency, phase and harmonic proportion of harmonic signal transmitter designed by this article.
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The M2C generates output voltage with lower harmonic
content than that for the two-level converter. Therefore, it
does not require ac filters. The absence of a switching
frequency component the arm current and operation
-The M2C generates out
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In this paper it is presented a detailed descr iption
of the analog implementation of the control for a DC-AC
converter composed by a DC-DC Zeta converter and a low
frequency inverter. Using only analog components, it was
developed the MPPT t
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Pisarenko谐波分解算法,详细画出了时域和频域的相关图，主同步信号PSS在时域上的相关仿真。- Pisarenko harmonic decomposition algorithm, Correlation diagram shown in detail the time domain and frequency domain, PSS primary synchronization signal in the time domain simulation related.
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