Pre-Selector Or Low Pass
Filter
local oscillator
Crystal Reference
Log Amp
video filter
sweep generator
CRT display
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实时频谱仪框图
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Real-time Spectrum Analysis
Trigger | on an RF signal based on power or frequency characteristics
10MHz Real-Time BW
15MHz Real-Time BW
15MHz Real-Time BW
36MHz Real-Time BW
-73dBc 3rd Order -74dBc 3rd Order -74dBc 3rd Order -78dBc 3rd Order Dynamic Range Dynamic Range Dynamic Range Dynamic Range
Capture | the signal seamlessly in time, into memory
Analyze | the signal simultaneously in multiple domains
Time Domain
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Frequency Domain
Modulation Domain
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Time-correlated multi-domain display Constellation view (调制域）
多域时间相关视图
干扰前
蓝牙
微波炉
WLAN信号
发出干扰的蓝牙信号
干扰过程中
WLAN星座同步
WLAN误差矢量 测量劣化
WLAN星座 失步
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新的 RF 信号测量方法
WWLLAANN在在干干扰扰过前程中
Acquired Signal Data Transformed into FFT Frames, No Overlap Processing
1024 Samples 1024 Samples 1024 Samples 1024 Samples 1024 Samples 1024 Samples
Acquired Signal, Post-Processed with Overlap FFTs
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传统频谱仪工作方式
扫频频谱෼ੳ仪Մೳձ丢ࣦ৴ଉ
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实时频谱仪工作方式---整个频段同时刷新
f TEK的实时频谱 分析仪在整个 span范围内实 时刷新，看到更 完美的信号特 性。
f 刷新速率也提高 四倍。
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测试刷新速率--传统频谱仪
实时频谱分析仪及雷达脉冲测试
触发
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捕获
分析
泰克公司
亚太区RTSA技术支持 钱永
电话：021-62896908 手机：13818983802 E-mail: yong.qian@
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信号分析
৴߸෼ੳ
时域
波形信息 幅度 周期 频率
频域
幅频信息 频率、功率 谐波、杂波 噪声、失真
调制域
矢量信息 幅度误差 矢量误差 相位误差
频率触发模板应用
Close-in burstmodulated signal Trigger Time
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பைடு நூலகம்
Wide band continuous signal
时域、频域、调制域多域分析功能
Time vs. Power View（时域）
Frequency vs. Power view（频域）
Error vector measurements
• Time-varying, bursted, and transient RF signals
• Complexity of wireless communication standards
• Digital modulation analysis
• Flexible time-correlated multi-domain analysis
RTSA 实时频谱仪系列
RSA2200A
RSA3300A
WCA200A
RSA3400A
Trigger
Level
Frequency mask, Frequency mask, Frequency mask, Power & Level Power & Level Power & Level
Capture
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Evolution of Signal Analysis Techniques
SA
Market Drivers
1960s
• Military • Communication systems • Emerging solid state
technology
Measurement • High frequency
f Can you tell what the signal is doing now?
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传统扫频频谱分析仪结构框图
య‫ܕ‬扫频仪త结构
RF input attenuator
IF gain mixer
IF filter
detector
• Seamless capture of RF signals changing over time
• Frequency domain trigger
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传统频谱仪工作方式--在测试频段内扫描
f 在传统扫频频谱仪 上每个时刻只能扫 到一个点，你看的 的信号是从左边到 右边的一个扫描信 号。
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1024 Samples
1024 Samples
Overlap Interval Samples
1024 Samples 1024 Samples
1024 Samples
1024 Samples FFT Overlap Samples
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重叠FFTs
模拟信号 捕获的时间取样记录
捕获的时间取样记录
FFT 帧 1024个样点
蓝牙突发
WLAN信号 发出干扰的蓝牙信号
WLWANLA没N有同同步步
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RTSA实时频谱仪的典型应用
f Radar, pulsed signals，frequency hopping signals （脉冲、雷达及跳频信号） f Signal monitoring & Surveillance（无线电监测） f RFID（无线身份识别） f WLAN（无线局域网） f RF and Communications Systems
WLAN, Pulse
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RSA3408A --- 最新的一款实时频谱分析仪
Improves Frequency Domain Resolution by 2,000 Times, Enabling Engineers to View Signal Instabilities and Transients that They Never Knew Existed.
f Frequency is the horizontal axis, time is the vertical axis, and power is represented by the color of the trace
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RSA3408A Overlap FFT Processing
Signal Captured in the Time Domain
– 功率触发 Power Trigger (Span BW) f Trigger on all events within the selected span of the analyzer that exceed the selected threshold. (Option 02)
– 频率模板触发 Frequency Mask Trigger f Trigger on discrete frequency domain events based on a flexible user-defined trigger mask. (Option 02)
f Reliably detect and capture elusive RF signals that a level trigger cannot see in a crowded spectral environment
= Frequency Mask Area
Trigger Occurs
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Analyze
Time, Frequency, Analog Modulation
Time, Frequency, Analog & Digital
Modulation
Time, Frequency, Analog & Digital Modulation, 2-3G
Time, Frequency, Analog & Digital Modulation, 2-3G,
f Now the signal is modulated.
f Can you tell what the signal is doing?
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测试刷新速率—实时频谱仪
f The digital spectrum analyzer has a much faster update rate.