描述

PCI-5421 可抑制不需要的高頻信號(hào)圖像

任意波形發(fā)生器是一種特殊的信號(hào)源，它具有綜合具有其它信號(hào)源波形生成能力，因而適合各種仿真實(shí)驗(yàn)的需要。它可以仿真各種測(cè)試信號(hào)，提供給被測(cè)電路，以達(dá)到測(cè)試的需要。
NI 5421系列采用100 MS/s、16位數(shù)模轉(zhuǎn)換器(DAC)和簡(jiǎn)潔的后端模擬設(shè)計(jì)，具有91 dBc的近距離無雜散動(dòng)態(tài)范圍(SFDR)平均噪聲密度為-148 dBm/Hz。這些功能使其非常適合通信中常見的最嚴(yán)格的頻域應(yīng)用。根據(jù)信號(hào)和應(yīng)用需求，用戶可以選擇2x、4x或8x插值，以獲得高達(dá)400 MS/s的有效采樣率。對(duì)于要求苛刻的時(shí)域應(yīng)用，NI 5421系列在模擬輸出處具有<5%的脈沖畸變和<1.0 ps rms抖動(dòng)。

模擬輸出路徑具有43 MHz 7極橢圓模擬濾波器，可抑制不需要的高頻信號(hào)圖像。用戶還可以選擇50或75？輸出阻抗并以三位數(shù)的精度改變輸出衰減。此外，還可以使用直接路徑繞過輸出增益和衰減。直接路徑非常適合中頻(IF)應(yīng)用，其通帶平坦度在0至40 MHz范圍內(nèi)為±0.25 dB。

共享波形和指令存儲(chǔ)器

由于NI 5421系列基于SMC架構(gòu)構(gòu)建，因此它們使用相同的物理內(nèi)存來存儲(chǔ)波形數(shù)據(jù)和排序指令。傳統(tǒng)上，AWG的指令存儲(chǔ)器在物理上與波形數(shù)據(jù)存儲(chǔ)器分開，通常只有幾kB。傳統(tǒng)AWG有限的指令內(nèi)存嚴(yán)重限制了可排序的最大波形數(shù)量以及AWG的整體靈活性。NI 5421系列的8、32或256 MB板載內(nèi)存將數(shù)據(jù)和指令存儲(chǔ)在一起，從而可以靈活地使用排序指令所需的空間。通過共享存儲(chǔ)器，可以將存儲(chǔ)器空間用于具有小波形的非常長(zhǎng)的序列、具有非常大波形的短序列或兩者之間的平衡。

PCI-5421 可抑制不需要的高頻信號(hào)圖像

Arbitrary waveform generator is a special signal source, it has the ability of synthesizing waveform generation of other signal sources, so it is suitable for various simulation experiments. It can simulate various test signals and provide the tested circuit to meet the needs of the test.
The NI 5421 series features a 100 MS/s, 16-bit digital-to-analog converter (DAC) and a concise back-end analog design with a 91 dBc short-range spury-free dynamic range (SFDR) with an average noise density of -148 dBm/Hz. These features make it ideal for the most stringent frequency-domain applications common in communications. Depending on the signal and application requirements, users can choose between 2x, 4x or 8x interpolation for effective sampling rates up to 400 MS/s. For demanding time domain applications, the NI 5421 series features &lt at the analog output; 5% pulse distortion and < 1.0 ps rms jitter.

The analog output path features a 43 MHz 7-pole elliptical analog filter to suppress unwanted high-frequency signal images. Users can also choose between 50 or 75? Output impedance and change output attenuation with three-digit accuracy. In addition, a direct path can be used to bypass output gain and attenuation. The direct path is ideal for intermediate frequency (IF) applications, with a passband flatness of ±0.25 dB in the range of 0 to 40 MHz.

Shared waveform and instruction memory

Because the NI 5421 series is built on the SMC architecture, they use the same physical memory to store waveform data and sorting instructions. Traditionally, the instruction memory of an AWG is physically separate from the waveform data memory, which is usually only a few kilobytes. The limited instruction memory of a traditional AWG severely limits the maximum number of waveforms that can be sorted, as well as the AWG’s overall flexibility. The 8, 32, or 256 MB of onboard memory in the NI 5421 series stores data and instructions together, allowing for flexible use of the space required for ordering instructions. With shared memory, memory space can be used for very long sequences with small waveforms, short sequences with very large waveforms, or a balance between the two.

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