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Signal generators and analyzers handle digital modulation0 M% u* F5 i- F1 i; A, B
数字调制信号发生器和分析仪5 ^( J. V% A2 s4 R- c
Aeroflex SDG and SVA RF wireless test instruments produce and analyze digital modulated signals.
% Y2 f8 i$ Y# W3 t3 {Aeroflex的 SDG 和SVA射频无线测试仪器能够产生和分析数字调制信号-- 8 N* u. Q& p, N+ Z* t
Test & Measurement World, 12/1/2011 3:36:26 PM
% K. N0 ]. z( I/ r5 t2 r3 p9 [测试与测量世界，2011年12月1日下午3时36分26秒
2 W( b. I# P4 GAeroflex has introduced digital-modulation generators and vector-signal analyzers, all with touch-screen interfaces, to its S-Series line of test instruments. The SDG-3 (3 GHz) and SDG-6 (6 GHz) digital-signal generators include an IQ modulator that lets them generate signals such as QPSK (quadrature phase-shift keying), QAM (quadrature amplitude modulation), and pulse-modulated signals, which are commonly used in wireless communications. The IQ modulator has a 300-MHz RF bandwidth. Both models can produce signals with +13 dBm output power (+20 dBm optional). Both models feature a two-channel AWG (arbitrary waveform generator) with a sample rate of up to 250 Msamples/s and signal memory up to 4 Gbytes. You can use the embedded IQCreator software to generate modulated carriers from the AWG signals." w$ N; |4 V( v
Aeroflex目前推出了数字调制发生器和矢量信号分析仪，他的S系列的产品线都带有触摸屏接口。该SDG-3（3GHz）和SDG-6（6GHz）数字信号发生器包括一个调制器，他们能发生如QP SK（四相相移键控），正交幅度调制（正交幅度调制），和脉冲调制信号，通常用于在无线通信领域。IQ 调制器有 300 MHz RF 带宽。: E7 N4 K8 M4 t1 X2 |0 [4 w
这两种型号信号发生器可发生13 + dbm (+ 20 dBm可选) 信号输出功率。$ c$ ^" B9 \! t# S
他们的采样率高达250 M/ s，而内存高达4 GB的双通道AWG（任意波形发生器）。您可以使用嵌入式的IQCreator软件从AWG信号产生调制载波。
9 I$ j6 M1 ~- c4 }7 D. VBoth SDG models have low SSB (single sideband) phase noise of -135 dBc/Hz at 1 GHz offset with frequency settling time of 100 μs. The IQ modulators have ACLR (Adjacent Channel Leakage Ratio) of -71 dBc on WCDMA signals.
' k% @+ Z6 I8 F7 b$ ^这两种型号的数字信号发生器，在1 GHz的频率，都有-135 dBc / Hz的低SSB（单边带）的相位噪声和100us的频率稳定时间。IQ调变器对WCDMA信号的ACLR（相邻通道泄漏比）为-71 dBc 7 s: K" w. s) _, ?: V4 u+ X
The SVA vector-signal analyzers also come in two models: SVA-6 (6 GHz) and SVA-13 (13 GHz). You can input signals with peak signal power levels up +30 dBm directly into either instrument. Their maximum sensitivity of -148 dBm/Hz lets you distinguish low-level signals from noise when measuring a transmitter's spurious outputs. The instruments can measure wireless signals for most wireless standards, including LTE (Long-Term Evolution). Measurements include power, modulation quality, and signal spectrum. Both SVA models have a noise floor of -138 dBc/Hz at 2 GHz with 10 MHz offset and frequency settling occurs in 250 μs at frequencies up to 6 GHz.
1 L- N' `: w" e' Y(SVA)矢量信号分析仪也出来两种型号： SVA-6 (6 GHz) 和SVA-13 (13 GHz)。该仪器可支持输入信号的峰值信号功率水平高达+30 dBm。他们的最高灵敏度为- 148 dBm /赫兹，当测量发射端的寄生输出时，能让你从噪声中区分低电平的信号。
: h$ a5 A1 E; ^+ E+ K该仪器可以测量大多数无线标准，包括3.9G(3G到4G的过渡)。测量包括电源，调制质量，信号频谱等。: x7 e2 q$ Y" `* u1 |' z9 `9 A. r: ?
当输入2 GHz的信号，10 MHz偏移量时,该SVA分析仪具有-138 dBc/Hz基底噪声.当信号高达6GHz的信号时，频率稳定时间在250us内。
$ | o) H3 b hWhen using the SDG and SVA instruments in a single test setup, you can synchronize them so they operate as a single source-and-measuring system. The instruments have a mechanical interlocking system that lets you attach them to each other on a bench or in a rack。 e( S+ y2 @$ X7 w$ w8 [6 t( a/ u
$ g6 i# ]) k: J0 e8 l# I& B/ D当同时使用 SDG和SVA在单个测试的装置里时，您可以使他们同步，让它们作为整体的信号源和测量系统。: h7 x& _/ w$ q
这些仪器有机械的联锁控制系统，您可以将它们彼此互联在测试台或者测试架上面。
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发表于 2012-1-5 11:44
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发表于 2012-2-18 14:01