大功率高速电动机高效率低噪声离心风扇的研究与设计

阐述了固定翼飞机机翼结构形状和轴流式风扇叶片以及汽轮机叶片形状在YKK560-2 10kV系列三相异步电动机离心外风扇叶片设计中的成功应用,从而设计出高效率、低噪声的新型离心式外风扇.     

无线电频谱监测与分析系统设计及实现

针对目前频谱监测系统的不足之处,给出了能够满足各地无线电管理部门需要的便携式、职能化、监测频谱范围宽的频谱监测系统的设计与实现方法.系统利用了动态库、VC操作Word以及并行处理的技术,重点针对低噪声放大器、驱动电机、天线控制器和干扰电平的计算进行了设计,系统能够完成频谱数据的采集、天线转动角度的采集、监测点地理信息的采集以及对采集的数据进行分析处理,最后自动生成监测报告.     

宽带一体化接收前端技术的研究

本文构建了一个通用化、标准化、模块化的带射频接收前端,结合指标要求,进行了系统指标的规划及方案 的可行性论证,利用ADS 软件对其关键指标进行了仿真验证,阐述了宽带射端的设计方法及步骤。通过对各个功能模 块的设计、选择、及调试,最终在200MHz-3200MHz 的频率范围内,采用二次变频技术设计了一种超外差接收前端。 介绍了宽带射频前端系统仿真研究、接收机系统的方案选择、大动态范围接收机的实现接收机技术指标的计算与仿真 和发射机系统的设计与仿真。介绍了宽带一体化接收前端技术的系统设计与实现以及2～6GHz 通用接收机研究及关键 电路的设计与实验。     

PIN光电探测器低噪声前置放大电路设计

该文设计了一款PIN光电探测器的低噪声前置放大电路,选用低噪声器件,设计带通滤波电路,实现阻抗匹配,消除噪声。该电路由＋15V和±5V三电源驱动,照射激光波长λ=850nm,光脉冲频率f=10kHz,光脉冲宽度τ=20ns。通过软件仿真及实物测试,达到响应度Re（V/W）≥2×10^5,上升时间Tr（ns）≤13,暗噪声电压峰峰值VN（mV）≤10,闭环增益A（dB）≥60等指标,表明该文方法可以为低噪声前置放大电路设计提供指导。     

卫星定位有源天线性能测试接口转换装置

在卫星有源接收天线测试过程中,受天线自身所带放大器增益的限制,其输出的信号功率无法达到后端测试设备最低输入灵敏度的要求,致使天线的某些性能测试工作无法进行。针对有源天线测试过程中遇到的接口不匹配和接收信号场强不匹配问题,提出了在被测有源天线与后端测试设备之间增加一个接口转换装置。该装置由SMA接头、低噪声放大器、直流电源隔离电路和防浪涌冲击电路构成。仿真表明,该接口转换装置能有效地完成在微波暗室里进行的卫星有源接收天线性能测试。     

应用于GSM/EDGE零中频接收机的CMOS射频前端

介绍了一个零中频接收机CMOS射频前端,适用于双带(900MHz/1800 MHz)GSM/EDGE;E系统.射频前端由两个独立的低噪声放大器和正交混频器组成,并且为了降低闪烁噪声采用了电流模式无源混频器.该电路采用0.13 μm CMOS工艺流片,芯片面积为0.9 mm×1.0 mm.芯片测试结果表明:射频前端在90...     

New current-mode current-controlled universal filter with single input and three outputs

In this study, a new current-mode current-controlled universal filter with single input and three outputs is presented. The proposed circuit uses single-output current controlled conveyors (CCCIIs) and can simultaneously realize lowpass, bandpass and highpass filter functions all at high impedance outputs. Realization of notch and allpass responses does not require additional active elements. The circuit enjoys independent current-control of the parameters ω₀ and ω₀/Q without disturbing the gains of the lowpass, bandpass and highpass filters. Both its active and passive sensitivities are low.     

Design of a capacitor cross-coupled dual-band LNA with switched current-reuse technique

This paper presents the design of a 2.5/3.5-GHz dual-band low-power and low-noise CMOS amplifier (LNA), which uses the capacitor cross-coupling technique and current-reuse method with four switches. The proposed LNA uses a single RF block and a broadband input stage, which is a key aspect for the easy reconfiguration of a dual-band LNA. Switching at the inter-stage and output allows for the selection of a different standard. The dual-band LNA attenuates the undesired interference of a broadband gain response circuit, which allows the linearity of the amplifier to be improved. The capacitor cross-coupled gm-boosting method improves the NF and reduces the current consumption. The proposed LNA employs a current-reused structure to decrease the total power consumption. The inter-stage and output switched resonators switch the LNA between the 2.5-GHz and 3.5-GHz bands. The proposed dual-band LNA optimises power consumption by the securing gain, noise figure and linearity. The simulated performance reveals gains of 16.7 dB and 19.6 dB, and noise figures of 3.04 dB and 2.63 dB at the two frequency bands, respectively. The linearity parameters of IIP3 are ?5.7 dBm at 2.5 GHz and ?9.7 dBm at 3.5 GHz. The proposed dual-band LNA consumes 5.6 mW from a 1.8 V power supply.     

Linearity improvement of cascode low-noise amplifiers using double DS method with a tuned inductor

We propose a highly linear low-noise amplifier (LNA) using the double derivative superposition method with a tuned inductor. This topology has an auxiliary common gate stage of the cascode amplifier to cancel each third-order intermodulation distortion (IMD3) component and can provide a high third-order input intercept point (IIP3) for the 5.25 GHz frequency band. From the simulation results using the TSMC 0.18 μm RF CMOS process, the IIP3 in the proposed cascode LNAs can be improved by 9 dB, compared with the conventional derivative superposition method. The proposed LNA achieves an IIP3 of + 15 dBm with a gain of 10.5 dB, a noise figure of 2.4 dB, and a power consumption of 6 mA at 1.5 V.     

低噪音电缆

从电缆噪音的基本概念出发,分析了电缆产生噪音的多种机理。就低噪音电缆的研发、生产现状,介绍了现有低噪音电缆的材料、结构、设计及品种。从电缆材料的选择、结构设计、生产工艺装备、标准及检测等多方面,详细论述了低噪音电缆的设计理念与技术。