Exploring Vector Signal Generators
Real-time waveform generation enables verification of receiver designs in all stages, from baseband subsystem coding all the way to sensitivity tests. When considering a vector signal generator of choice, there are various parameters to look at: switching modes for signal generation, creating your own waveforms, and exploring different testing scenarios. You should also consider the architecture differences, comparing traditional vs. DDS (direct digital synthesizer), as well as various other challenges that Vector Signal Generators can help solve.
Current Customer Challenges
Many RF engineers face new design and test challenges, including meeting ever-involving standard requirements, delivering performance, and accelerating time to market in today's competitive landscape. The demand growth for faster data rate applications triggers the need for new technologies capable of wider signal bandwidths and higher frequencies. Currently, the 5G New Radio (NR) standards specify frequency range 2 (FR2) from 24.25GHz to 52.6GHz and a maximum channel bandwidth of 400MHz.
Wider bandwidths enable high-throughput data and low latency. However, they also introduce more noise that degrades the system performance. Wireless engineers need to deal with the noise problem for wideband communications. Current wireless devices support multiple frequency bands and wireless formats and support for multiple antennas. These complex devices make the process of designing, testing, and isolating system problems more challenging. This leads to longer development lifecycle times, which slows down time-to-market.
Common Vector Signal Generator Architecture
The main feature that stands out in a traditional vector signal generator architecture is the inclusion of the I/Q modulator. The I (in-phase) and Q (quadrature) signals from a baseband generator's output travel to the I/Q modulator and upconvert with mixers to an intermediate frequency (IF) and RF signal. Before combining the I and Q signals, the I and Q signals mix with a same local oscillator (LO) and insert a 90-degree phase shifter in one of the LO paths.
Figure 1. A block diagram of a vector signal generator
Each component in the I/Q modulator contributes errors such as gain imbalance, timing skew, quadrature skew, DC offset, and phase noise (virtual: pop up these errors from the I/Q modulator). To visualize the modulator errors, we use the baseband generator to create a 16-multitone signal as an example. The output signal from traditional I/Q modulator generates nonlinear distortion that reduces the overall signal dynamic range. Figure 2 shows the intermodulation distortion between the 16 tones caused by the modulator and RF section. For a modulated signal, the distortion will degrade the signal quality and cause measurements failure. Therefore, to minimize the distortion for the signal generation is critical to accurately characterize wideband RF components and evaluate the receiver's performance.
Figure 2. A multitone signal with intermodulation distortion
KEYSIGHT explored some of the challenges that slow down your 5G testing. Taking into account traditional generator signal architecture, many of these challenges currently do not have adequate solutions. However, delving more into the future of vector signal generator architecture, learning how higher frequency coverage, wider bandwidths, and multi-channel applications can result in a breakthrough performance.
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Keysight（是德科技）汽车测试产品选型指南（英文）
目录- Increasing Speed, Safety, and Reliability of In-Vehicle Communications Networks Data Acquisition for Accurate Automotive System Analysis Taming the Hostile RF World of Today’s Vehicles Managing Power in a Harsh Automotive Electrical Environment EMI Pre-Compliance Testing for Automotive Designs Handheld Instruments for Accurate Portable Automotive Testing General Bench Test and Accessories Test Automation with PathWave BenchVue Software
型号- N7026A,DAQ970A,4000 X,N2790A,N6705C,N5166B CXG,N6700 SERIES,3000T X-SERIES,N6700,3000T X,34980A,S-SERIES,6000 X,N9000B CXA,N7900,4000 X-SERIES,MSOX4154A,6000 X-SERIES,N7900 SERIES
SCPI Command Reference Volume 3 Agilent Technologies E4428C/38C ESG Signal Generators
型号- 8648A,8657J,E44XXB,E4438C,8657D,E4428C,8648D,8657B,8648B,8648C,8658B,8657A
【选型】Keysight（是德科技）PXI / AXIe 模块化产品选型指南（英文）
目录- PXI / AXIe Modular Product Introduction High-Speed Chassis, Controllers, and I/O Components PXIe RF Instruments AXIe Instruments General-Purpose Oscilloscopes, Digitizers and More PXI and AXIe Test Solutions
型号- M9391A,M9121A,M9242A,M9133A,S9101A,M8020A,M8192A,M9514A,M9502A,M9336A,M937XA,M9421A,M9122A,M9243A,M9037A,M9203A,N1930B,M8045A,U4421A,M9808A,M9537A,M9703B,89600,M9161D,M3201A,M9393A,M9381A,M9187A,M9146–49A,M9111A,M9135A,M9155–57C,M8046A,M8195A,M8194A,M9710A,M9601A,M9411A,M9043A,M9164B,M9164A,M8920A,M9380A,M8196A,M8062A,M9410A,M3102A,M9260A,M9383B,E5500,M9165C,M9165B,M9165A,M9101A,M8197A,M8051A,M9615A,M9506A,M9192A,M9164C,M9130A,M9155-57C,M9102A,M9005A,M924XA,M8041A,M8040A,M9505A,M9804A,M9614A,M3302A,M9290A,M3100A,M9181A,M9193A,M9383A,M9010A,M9240A,M9131A,M9103A,M9018B,M9155-57CH40,M924XA SERIES,M8190A,M3202A,M8100A SERIES,M9182A,M9120A,M9241A,M9132A,M9128A,X-SERIES,M8100A,M9019A,N5511A,M9709A,M9183A,M9195B,M3300A
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提供是德(Keysight)，罗德(R&S)测试测量仪器租赁服务，包括网络分析仪、无线通讯综测仪、信号发生器、频谱分析仪、信号分析仪、电源等仪器租赁服务；租赁费用按月计算，租赁价格按仪器配置而定。
提交需求>
配备KEYSIGHT网络分析仪，可测量无线充电系统发射机/接收机线圈的阻抗，电感L、电阻R、电感C以及品质因数Q，仿真不同充电负载阻抗下的无线充电传输效率。支持到场/视频直播测试，资深专家全程指导。
实验室地址： 深圳 提交需求>
授权代理品牌：集成电路
授权代理品牌：分立元件
授权代理品牌：接插件及结构件
授权代理品牌：部件、组件及配件
授权代理品牌：电源及模块
授权代理品牌：电子材料
授权代理品牌：仪器仪表及测试配组件
授权代理品牌：电工工具及材料
授权代理品牌：机械电子元件
授权代理品牌：加工与定制
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