基于AD7705的RTD温度测量C51程序设计

本文介绍了基于 AD7705 的 RTD 温度测量系统的工作原理和性能特点,该系统利用高性能的模数转换器 AD7705 的两通道的特性,与 RTD　相结合,使整个测量系统具有较高精度、低成本、接口简单的特点,还主要介绍了以 AT89C52 单片机为主机的测量 C51 程序设计方法。该接口方法已成功应用于量热仪中。     

基于星座图和卷积神经网络的射频指纹识别

基于无线设备物理层的射频指纹识别是保障通信安全的有效途径。传统射频特征提取方法容易受到信道的信噪比变化的干扰,难以适应动态信噪比下的通信场景。因此,本文提出了一种基于卷积神经网络的射频指纹识别方法,实现了动态信噪比下的射频指纹识别,显著改善了低信噪比下的识别准确率。本文通过搭建实验系统对4台不同功放设备进行识别,实验结果表明,在信噪比为0.5~14.5 dB范围内,该方法的综合识别率达89.4%。     

Doherty功率放大器的设计与分析

本文介绍了采用Doherty结构来设计高效率功率放大器。载波放大器和峰值放大器分别工作在AB类和C类状态。首先用ADS进行单管AB类和C类功放仿真设计,然后选择合适的延迟线来完成Doherty的整体设计,最终仿真结果显示Doherty功放在功率回退6db的情况下（43dbm）,其PAE达到了51％。     

PWM技术在程控放大器设计中的应用

针对目前基于D/A转换器件、模拟开关或数字电位计的程控放大器设计硬件成本高、增加系统噪声的缺点,本文设计了采用PWM转D/A技术的程控放大器,提高了精度,节约了硬件成本,降低了系统噪声。     

一种10GHz高增益低噪声放大器设计

提出了一种带有输入匹配网络优化方法的窄带10GHzLNA电路。通过插入全新的输入匹配网络,不仅满足LNA低噪声的要求,同时更使增益有所提高。提出的LNA采用0．181μmSiGeBiCMOS工艺,工作频率为10GHz。结果表明,提出的窄带HBT10GHzLNA电路,在10GHz频段测试增益大于lldB,噪声3．6dB,功耗9mw,达到了较好的匹配效果,有较好的稳定性,满足了收发机对LNA的指标要求。     

MATHA: Multiple sense amplifiers with transceiver for high performance improvement in NoC Architecture

Now-a-days there is much research attempts aim to find out low power consumption in the area of Network-on-chip (NoC), both in architectural as well as algorithmic approach. Even though a lot of Double Tail Sense Amplifiers (DTSA) are used in architectural approach, the conventional DTSA with transceiver exhibits a difficulty of consuming more energy than its indented design during heavy traffic condition. Multiple sense amplifiers with transceiver for high performance improvement in NoC Architecture (MATHA) is designed in this research to eliminate the difficulty. This MATHA is a combination of reconfigurable DTSA and transceiver. The reconfigurable DTSA consist of modified DTSA (M-DTSA), modified clock gating with DTSA (MCG-DTSA), Modified Dual Edge Triggered with DTSA (MDET-DTSA), Soft-DTSA (S-DTSA), graph theory based traffic estimator and multiplexer. Depending upon the traffic rate, one of the DTSA among the available four DTSA is selected and information transferred to the receiver. The proposed MATHA design is evaluated on TSMC 90 nm technology, showing 6.1 GB/s data rate and 0.32 W total link power.     

基于87C520CPU的动态称重仪表控制系统

本文介绍了以87C520CPU为核心的高可靠性的动态称重新一代皮带秤仪表SA201H。在精确设计并充分利用了自身软硬件资源的基础上,该系统具有称量精度高、使用方便等特点。     

高效D类音频放大器MAX9700/MAX9712

MAX9700／MAX9712是MAXIM公司生产的低EMI、免滤波、高效率D类音频放大器，其中MAX9700的负载功率为1．2W，MAX9712为500mW，适合MP3、PDA等便携式音频应用，文中对它们的结构、功能、主要特点及应用作了详细介绍。     

二十四所射频及模拟放大器集成电路发展历程与展望

回顾了二十四所射频及模拟放大器集成电路专业方向的发展历程，并对未来发展进行了展望。按不同历史阶段，介绍了二十四所在集成运算放大器／比较器、中频／视频线性／非线性放大器、MMIC、集成射频放大器等产品类别所取得的主要成就；并对高性能模拟放大器IC技术的发展进行了讨论。     

Single CDTA-based current-mode quadrature oscillator

This letter presents a single CDTA (Current Differencing Transconductance Amplifier)-based current-mode quadrature oscillator (QO). The proposed circuit structure is very simple, which only consists of one CDTA, one resistor and two capacitors, and it is easy for monolithic integration. The oscillation frequency of the QO can be electronically controlled by the bias current of the CDTA. Moreover, the oscillator can provide two quadrature current outputs. PSPICE simulation results are provided to verify all the theoretical analysis.