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Signal generators and analyzers handle digital modulation
( ~4 V8 ?: o8 d. o7 X数字调制信号发生器和分析仪: K+ S; l+ G/ w
Aeroflex SDG and SVA RF wireless test instruments produce and analyze digital modulated signals.8 R. _0 e* R/ J# S) I0 e
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-- " d! t u, M) _0 u5 H! i; U
Test & Measurement World, 12/1/2011 3:36:26 PM2 ~" ?; I+ P5 w6 S
测试与测量世界，2011年12月1日下午3时36分26秒
m8 N& I+ y4 B$ t/ R' v% r LAeroflex 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.& i( E8 S8 ]8 R1 f% X
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。
! n4 @5 ?. X7 E' n9 Y% ]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。6 P6 s% v+ s5 u6 N
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。; V- I2 F" P' K5 i
Both 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.0 d2 o- s. J$ `( N# e- j9 S! p
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 ' a1 L3 v9 A1 q
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.) u& o/ E+ T% [' \5 R
(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。8 J" C( ]- x; X+ Z
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。
. F; z& C4 X t* s, X8 G6 }0 ^2 m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。
) @' H0 K* f5 x# O( wWhen 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。+ H5 @$ C& b$ I$ P+ S
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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。: ?& H; u B4 z% S, H, ^4 O; u
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。( p$ _+ ], q$ ]* W2 u" R" r# ]
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发表于 2012-1-5 11:44
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发表于 2012-2-18 14:01