Learn the Basics of Signal Generator Accuracy
Jumping into the world of Signal Generators for the first time can be a daunting journey. There are lots of technical considerations, and it is not always obvious which ones are the most important to focus on. In this article, KEYSIGHT will provide guidance on the things you need to be aware of when selecting an RF signal generator.
What is a Signal Generator?
Signal generators provide precise, highly stable, and customizable test signals for a variety of components and system test applications that emulate real-world scenarios. The outputs can be anything from a simple continuous wave to more complex modulated digital signals. Signal generators are an important part of product development because they enable you to apply signal impairments to test your product in various conditions within and beyond design limitations.
What Affects Signal Generator Accuracy?
Amplitude Accuracy
Amplitude accuracy compares the proximity of the signal generator's output to the desired amplitude set by a user. If we use the example of frequency sweeping to test filters and power amplifiers, choosing a signal generator with a tighter amplitude frequency specification provides a more uniform output across a frequency range. Figure 1 illustrates the flatness of a signal generator when determining the amplitude accuracy across a group of frequencies.
Figure 1. Amplitude accuracy of a source across the frequency
Frequency Accuracy
Two key factors for understanding the accuracy of a generated frequency are the stability of the reference oscillator and the time between source calibrations. The time between calibrations is also known as the aging effect. Frequency accuracy is vital to RF applications especially where bands have data that are closer together. For example, in wireless communications, it is important to understand how well a receiver can process a signal while rejecting the signal from an adjacent channel. Poor frequency accuracy will cause the signals to be too close or too far and give a misleading indication of the performance of the device under test (DUT).
Figure 2. Error difference between the desired signal and generated signal
Spectral Purity
Every signal generator has an unwanted amplitude and phase fluctuations on a signal that naturally occurs. Regardless of a source's signal stability, choosing a signal generator that has better spectral accuracy compared to the system requirements will prevent you from measuring the signal generator performance versus the DUT. Spectral purity is characterized by evaluating harmonics, sub-harmonics, spurs, and phase noise. In datasheets, it's common to see the spectral purity represented as the single side band (SSB) phase noise.
Figure 3. Various non-ideal spectral components
EVM Measurement
Error vector magnitude (EVM) is the vector difference between the ideal reference signal and the measured signal at a given time, as depicted in Figure 4. This is commonly used to define the performance of a digital radio transmitter or receiver. Signal generators designed with smaller EVM percentages enable you to design and test systems to reach higher data capacity, better power efficiency and increase wideband signal power.
Figure 4. EVM is the difference between the actual measured signal and the ideal reference signal
The impact of distortion on Performance
Spectral regrowth refers to the distortion generated by amplitude and phase shifts in digital modulations. Spectral regrowth spreads outside the main channel and adjacent channel power ratio (ACPR) measurements enable examination of this characteristic. Similar to spectral purity, it's important to choose a signal generator with a superior distortion test margin that won't mask the performance of the DUT.
Figure 5. Example of an ACPR measurement
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E8257D PSG微波模拟信号发生器
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KEYSIGHT - 微波模拟信号发生器,PSG MICROWAVE ANALOG SIGNAL GENERATOR,E8257D
MXG X系列信号发生器N5183B微波模拟数据表
KEYSIGHT - 信号发生器,SIGNAL GENERATORS,N5183B-513,836XX SERIES,E8244A,8665A,8665B,SMJ100A,8648,N5183B-520,8648 SERIES,SMIQ,N5181A,N5161A,8341B,E8267C,E8247C,SMBV100A,E4428C,E443XB,8664A,E8251A,8656B,8644A,E8663B,E8267D,SML,SMR,SMATE200A,SMV,N5162A,N5183B-532,SMU200A,N5182A,8340B,E8254A,8663A,83732B,MXG X,83712B,SMB100A,83752B,N5183B-540,E442XB,N5183B,N5183A,SMF100A,E8257D,E8257C,8662A,X-SERIES,E4438C,E8241A,MXG X-SERIES,83711B,MG369XA,836XX,MG369XB,MG369XC,83751B,83731B
E8267D PSG矢量信号发生器数据表
KEYSIGHT - 全合成信号发生器,矢量信号发生器,VECTOR SIGNAL GENERATOR,FULLY SYNTHESIZED SIGNAL GENERATOR,E8267D-1A7,E8267D-HFA,E8267D-H1G,E8267D-409,E8267D-009,E8267D-544,E8267D-423,E8267D-SP2,E8267D-602,E8267D-007,E8267D-403,E8267D-004,E8267D-SP1,E8267D-520,E8267D-003,E8267D-H18,E8267D-HCC,E8267D-UNW,E8267D-UNY,E8267D-UK6,E8267D-UNX,E8267D-1EM,E8267D-UNU,E8267D,E8267D-UNT,E8267D-AMG,E8267D-016,E8267D-A6J,E8267D-HBR,E8267D-513,E8267D-HBQ,E8267D-532,E8267D-1EH,E8267D-HNS,E8267D-1ED,E8267D-H1S
Keysight Launches Next-Generation Vector Signal Generator N5186A for Dense Wideband Multichannel Applications
Keysight introduces a new compact, four-channel vector signal generator capable of signal generation up to 8.5GHz with 960MHz of modulation bandwidth per channel. By providing consistent and repeatable results, It is an ideal solution for a broad range of commercial and aerospace defense applications.
Keysight Enables Altice Labs to Verify Performance of O-RAN Radio Units
Keysight Technologies, announced that Altice Labs has selected the Keysight O-RAN Radio Architect (KORA) solutions to advance development of O-RAN equipment and deliver certification services.
Signal Studio、X-Apps和89600 VSA软件的订阅捆绑包配置指南
Keysight推出新的订阅捆绑软件许可，适用于PathWave Signal Generation (Signal Studio)、PathWave Measurement Application (X-apps)和PathWave Vector Signal Analysis (89600 VSA)。这些订阅捆绑包提供灵活的许可类型和期限，包括预定义和动态两种类型，旨在降低前期成本，保持技术更新，并适应项目变化。此外，还提供了针对特定应用的折扣，并提供了多种捆绑包选项，包括信号生成、测量应用和向量信号分析。
KEYSIGHT - SIGNAL ANALYZERS,SIGNAL GENERATOR,信号发生器,CUSTOM MODULATION PACKAGE,信号分析仪,无线封装,蜂窝式封装,脉冲分析包,CELLULAR PACKAGE,PULSE ANALYSIS PACKAGE,WIRELESS PACKAGE,定制调制包,N7624EMBC,N76XXAPPC,N7689BA5C,N7631APPC,N7606EMBC,89601AYAC,89601BHMC,N7624ORNC,N7618APPC,N7640EMBC,N9065EM1E,N7614EMBC,N9089B04E,N9063EM0E,N7630EMBC,N9055EM0E,89601C,N9068EM0E,N9077EM2E,N9080EM4E,N7626EMBC,89601BHTC,N7625APPC,N9092EM0E,N7608EMBC,N7689EM4C,89601301C,N9061EM0E,N7612EMBC,N9089B03E,N9093EM1E,N7637APPC,N9082EM0E,N9080EM3E,N7602EMBC,N9073EM0E,N9067EM0E,N7610EMBC,89601B7RC,N9076EM0E,N9089B02E,89601CSDC,N7689EAXC,N9071EM0E,N7618APPC,N9084EM0E,N9089B01E,N7617EMBC,N90EMBWSB,N9065EM0E,N6141EM0E,89601EVMC,89604C,N9079EM0E,89601PSMC,N7607EMBC,N7624APPC,N7615EMBC,N7631ORNC,89601BHQC,N7631EMBC,N7689AP1C,N9054EM0E,N76XXEMBC,N7623EMBC,N9085EM0E,89601CC2C,89601BHXC,N7625ORNC,89601B7NC,N9080EM0E,N7626APPC,N9093EM0E,N7689PAXC,N7609EMBC,89601BHPC,N7642APPC,N7600EMBC,N7689EAZC,N7608APPC,N9062EM0E,N7625EMBC,N9056EM0E,89601BHHC,N9069EM0E,N9054EM1E,89601200C,N7630APPC,N7689B5BC,N7637EMBC,N7653APPC,N9091EM0E,89602C,N9077EM1E,N7611EMBC,89601CC1C,N7601EMBC,N9081EM0E,89600 VSA,N7689EM1C,89601BHGC,N7608RAWC,N9072EM0E,N7621APPC,89603C,N7689ORNC,N7605EMBC,89601BAXC,N7651APPC,N9077EM0E,X-SERIES,N7689PAZC,N9089BAXE,89601BHNC,N7689EM2C,89601101C,N9083EM0E,89601BHFC
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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。
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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>
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