Pin/HBT OEIC光接收机

介绍了pin/HBT单片集成OEIC光接收机的集成结构和电路结构,分析了这种集成方式的光接收机前端设计过程中影响带宽和灵敏度的因素,总结了集成器件最新的研究进展。     

光电子集成电路进展

较详细地介绍了光电子集成电路(OEIC)中研究最广泛、并取得可喜成就的OEIC光接收机和OEIC光发射机的最新进展,展望了OEIC的应用前景,并提出了目前应解决的课题。     

韩国的OEIC研究

本文按年代介绍韩国光电子和光电集成电路（OEIC）的进展以及用于通信的OEIC发射机和接收机，用于光开关和光计算的半导体激光逻辑器件。     

Si基高速0EIC光接收机芯片的研究

Si基光电子集成(OEIC)光接收机在光通信系统接入网、光互连、光存储等方面有着广泛的应用前景。本文综述Si基OEIC光接收芯片的研究现状，分析了其发展趋势，探讨了进一步提高性能的途径。     

高速光电集成发送、接收微型组件问世

日本富士通公司新近开发了由OEIC(光电集成回路)构成的光通信发送、接收组件。该组件可传输400Mb/s的高速数字光信号,居世界领先地位。所谓OEIC,则是将LD或LED与电子回路集成在一个基片上的新型光装置。它的应用将使原来的光发送机和接收机迅速达到高速化和小型化。     

长波长PIN／HBT集成光接收机前端噪声分析

文章研究磷化铟(InP)基异质结双极晶体管(HBT)和PIN光电二极管(PIN-PD)单片集成技术,利用器件的小信号等效电路详细计算了长波长PIN/HBT光电子集成电路(OEIC)光接收机前端等效输入噪声电流均方根(RMS)功率谱密度.分析表明:对于高速光电器件,当频率在100 MHz～2 GHz范围内时,基极电流引起的散粒噪声和基极电阻引起的热噪声起主要作用;频率大于5 GHz时,集电极电流引起的散粒噪声和基极电阻引起的热噪声起主要作用.在上述结论的基础上,文章最后讨论了在集成前端设计的过程中减小噪声影响的基本方法.     

光接收机前端等效输入噪声电流谱密度与噪声系数间的关系

根据光接收机前端等效电路模型,建立了噪声系数与等效输入噪声电流谱密度的关系.提出通过测量光接收机前端电路噪声系数间接获得等效输入噪声电流谱密度的方法.155Mb/s高阻结构光接收机前置放大器的电路仿真与计算验证了推导公式的正确性.最后给出在芯片测试实例.     

光接收机前端等效输入噪声电流谱密度与噪声系数间的关系

根据光接收机前端等效电路模型,建立了噪声系数与等效输入噪声电流谱密度的关系.提出通过测量光接收机前端电路噪声系数间接获得等效输入噪声电流谱密度的方法.155Mb/s高阻结构光接收机前置放大器的电路仿真与计算验证了推导公式的正确性.最后给出在芯片测试实例.     

电子器件

Y2000-62067-388 0014330应用 CMOS 工艺研制的 N 阱100MHz 同步光电集成电路光接收机=A 100MHz Synchronized OEIC pho-toreceiver in N-well,CMOS technology[会,英]/Ayadi,K.& Panielsen,P.//1998 IEEE International Confer-     

在HFC中应用PON实现宽带接入

构建双向HFC网络，开展宽带接八业务，实现回传需要很多根光纤，而且光信号到了前端后，前端需要很多回传光接收机，同时汇聚噪声会十分明显。例如：一个HFC网络，采用星型结构，有n个光节点．那么下行需要n根光纤，上行还需要n根光纤，前端再需要n个回传光接收机，而且在模拟电视业务基本普及的今天，多功能应用、     

An X-Band AlGaN/GaN MMIC Receiver Front-End

This letter presents an integrated AlGaN/GaN X-band receiver front-end. This is to the authors knowledge the first published results of an integrated AlGaN/GaN MMIC receiver front-end. The receiver uses an integrated SPDT switch to reduce size, weight and cost compared to circulator based transceiver front-ends. The integrated front-end has more than 13 dB of gain and a noise figure of 3.5 dB at 11 GHz.      

基于AlGaN/GaN HEMT太赫兹探测器的340 GHz无线通信接收前端

利用天线耦合AlGaN/GaN HEMT太赫兹探测器的自混频和外差混频效应,分别设计并测试了340 GHz频段直接检波式和外差混频式接收机前端。通过接收机信噪比的测量和接收功率的定标,得到了两种接收机的等效噪声功率。直接检波模式下探测器的响应度约为20 mA/W,直接检波模式和外差混频模式下接收机的等效噪声功率分别约为?64.6 dBm/Hz1/2和?114.79 dBm/Hz。在相同的载波功率和接收信号带宽条件下,当本振太赫兹波功率大于?7 dBm时,外差混频接收的信噪比优于直接检波的信噪比。当本振功率大于0 dBm时,外差混频接收机表现出优良的解调特性,其信噪比高出直接检波接收机的信噪比10 dB以上。     

多通道射频接收机测量噪声系数的新方法

噪声系数是多通道射频接收机的一个重要参数。传统的噪声系数测量方法对大噪声系数测量存在不足,且测量时通道间会有噪声干扰。提出一种多通道切换优化测量噪声系数的方法:通过设计1个八选一的射频开关实现信道切换,并引入前置低噪声放大器的控制电路提供冷热噪声源,优化Y因子测量噪声系数的方法,实现对各通道的精确测量。由于接收机前端的相似性,该方法可推广应用到其他的射频接收机。     

RF beamforming for MIMO cognitive user

Using Multiple Input Multiple Output (MIMO) architecture in cognitive radio (CR) secondary users improves the system performance in terms of interference cancellation and data rate enhancement but at the expense of adding complexity and cost. A solution to reduce this complexity is employing radio frequency (RF) beamforming networks at the transmitter/receiver front-ends. In this paper, we consider a MIMO secondary user equipped with such RF beamforming network. Moreover, we find the transmit/receive optimum RF beamforming network for a MIMO spatial multiplexing system. We evaluate the performance of the optimally designed RF beamforming technique over a Rician channel via computer simulations. The simulation results are assessed for different RF beamforming structures and the number of primary transmitters which cause interference on the secondary receiver.     

The coding-spreading tradeoff in CDMA systems

General definitions of spreading and coding are given based on the notion of Shannon bandwidth introduced by Massey (1994), with the goal of distinguishing these operations for signaling with bandwidth redundancy. These definitions are shown to lead to a separation result: every bandwidth redundancy scheme can be expressed as a concatenation of coding followed by spreading. The coding-spreading tradeoff problem is then studied for a code division multiple access (CDMA) system in which the receiver processes the received signal by using a user-separating front-end, which feeds into autonomous single-user decoders. Under the single-user decoding setting, it is established that the linear minimum mean square error (LMMSE) front-end multiuser detector is optimum among all front-ends that are constrained to use only spreading information. Also, conditions are given for the single-user decoders to ignore spreading information without losing optimality. An example illustrating the coding-spreading tradeoff optimization for a direct sequence CDMA system with random spreading is given. Single-cell and multicell scenarios are considered in the optimization, and a comparison is made of the spectral efficiencies that can be achieved with the conventional matched filter and LMMSE front-ends     

A 17-mW 0.66-mm/sup 2/ direct-conversion receiver for 1-Mb/s cable replacement

A very-low-cost wireless personal area network (WPAN) receiver implemented in 0.25-/spl mu/m CMOS technology consumes 17mW of power and occupies an area of 0.66 mm/sup 2/. Simplicity in the physical layer, which still supports the 1-Mb/s requirement, allows for power savings in the receive front-end. A new coding scheme permits the integration of a high-pass filter to mitigate DC offset and 1/f noise. A linear front-end eliminates the external band-preselect filter. This die area is the smallest reported for Bluetooth-class front-ends.     

射频前端接收机频率规划

在无线通信系统的片上系统（SoC）设计中，模拟射频前端高层次仿真、综合和优化的工具还不成熟，制约了整个系统的开发周期。射频前端的频率规划直接影响系统的复杂度、集成性和功耗，目前的频率规划主要是由经验丰富的设计师根据经验和直觉确定，而不是通过量化分析。本文在射频前端设计方法的基础上，以定量优化的方法处理射频前端频率规划问题，提出了两级优化模型，补充和完善了以往提出的射频前端设计方法。     

Code-modulated path-sharing multi-antenna receivers: theory and analysis

Conventional multi-antenna receiver front-ends require multiple RF/baseband chains and analog-to-digital converters (ADC). This increases power consumption and chip area substantially. In this letter, we introduce a new Code-Modulated Path-Sharing Multi-Antenna (CPMA) receiver architecture suitable for any multi-antenna scheme including spatial multiplexing, spatial diversity, and beamforming. The receiver uses code modulation to distinguish the antenna signals before combining them in the analog domain. The combined signal propagates through shared-path blocks and all the original signals are later recovered in the digital domain for further processing. Due to the spread spectrum nature of code modulation, a larger bandwidth is needed for the blocks in the shared path. To alleviate this effect, the use of non-orthogonal coding is examined. An effective channel matrix is derived and the system capacity is evaluated in terms of the cross-correlation between signature codes. Implementation and code selection issues are discussed. Analysis and simulation results indicate that by properly selecting non-orthogonal code sets, the spreading factor, and therefore, the overall analog signal bandwidth is reduced while incurring minimal performance degradation.     

A Low-Power 2.4-GHz Current-Reused Receiver Front-End and Frequency Source for Wireless Sensor Network

In this paper, we present a receiver front-end and a frequency source suitable for wireless sensor network applications, in which power consumption is severely restricted under several milliwatts. For such an extremely low-power receiver, current-reusing and frequency multiplying schemes are proposed for both the RF front-end and frequency source. The proposed front-end achieves a conversion gain of 30.5 dB and a noise figure of 10.2 dB at the 10-MHz intermediate frequency (IF), taking only 500-muA bias current from a 1.0-V supply voltage. The measured phase noise of the fabricated frequency source is -115.83 dBc/Hz at 1 MHz offset from a 2.2-GHz center frequency, taking 840 muA from a 0.7-V supply. The front-end performance is compared with the previously reported low-power front-ends operating in similar frequency ranges     

Two-step channel selection-a novel technique for reconfigurable multistandard transceiver front-ends

This paper starts with a review of the prevailing channel-selection techniques utilized so far in the design of wireless transceiver analog front-ends before describing a novel two-step channel-selection technique, which handles the traditionally unwanted image, in radio frequency-to-intermediate frequency (RF-to-IF) or IF-to-RF frequency conversion, as a useful adjacent channel of the desired one, and selects deliberately either of them from IF to baseband (or baseband to IF). Thus, one more channel-selection possibility is created for both low-IF receivers and two-step-up transmitters. The consequential benefits of introducing channel selection at IF consist of two. First, many design specifications (such as phase noise and settling time) of the RF frequency synthesizer and local oscillator can be substantially relaxed. Second, a low-IF/zero-IF reconfigurable receiver and a direct-up/two-step-up reconfigurable transmitter can be synthesized to match better with narrowband-wideband-mixed multistandard systems. The operating principles of such architectures are presented in easy-to-understand complex-signal spectral-flow illustrations, and their practicability is demonstrated in the design of a Bluetooth/IEEE 802.11FH/HomeRF multistandard receiver. SPECTRE simulation results validate the reconfigurable functionalities mainly implemented by a triple-mode channel-select filter and a multifunctional sampling-mixer scheme.