PCI-5421 任意波形发生器  用于生成重复或单次的电波形

PCI-5421是美国国家仪器公司的任意波形发生器。PCI-5421器件有三个版本，具有板载内存大小的三个选项。部件编号778692-01具有8 MB板载内存，部件编号778692-02具有32 MB板载内存，部件编号778692-03具有256 MB板载内存。该装置用于生成用户定义的任意波形。PCI-5421器件还可以生成标准的正弦、斜坡、三角形和正方形信号。为了精确生成波形，PCI-5421采用直接数字合成(DSS)。该设备还可以用于流数据和高级同步。

PCI-5421带有一个模拟输出通道，该通道有一个SMB(插孔)连接器。输出通道的DAC分辨率为16位。它是直流耦合型。PCI-5421器件的输出通道可以在相似的路径上组合波形。这意味着该设备支持波形求和。因此，可以连接不同模块的输出端子。PCI-5421波形发生器设备的最大带宽为43 MHz。该设备具有7极椭圆滤波器。

任意波形发生器是一种电子测试设备，用于生成重复或单次的电波形。它具有多种功能，包括产生正弦波、锯齿波、三角波和矩形脉冲等，并能模拟更复杂的信号要求。任意波形发生器的核心部分是DDS（Direct Digital Synthesizer），它通过相位累加和波形查表两个模块组成，能产生高精度、低失真的信号。

此外，PCI-5421任意波形发生器还能用于仿真实验室所必须的信号，以模拟实际电路中的各种信号缺陷和瞬变信号，如过脉冲、尖峰、阻尼瞬变、频率突变等。这些信号可能在电路设计之初没有考虑进去，如果不进行仿真模拟，可能会产生灾难性后果。

为了增强波形生成能力，任意波形发生器通常依赖计算机通讯输出波形数据。在计算机传输中，通过专用的波形编辑软件生成波形，有利于扩充仪器的能力，更进一步仿真模拟实验。同时，一些任意波形发生器内置一定数量的非易失性存储器，能随机存取编辑波形，有利于参考对比；或通过随机接口通讯传输到计算机作更进一步分析与处理。

PCI-5421任意波形发生器的选型需要考虑多个重要的参数，包括信号最高输出频率、采样率、幅度范围、准确度、信号质量、任意波长度等。例如，安捷伦的33621A任意波形发生器提供了比上一代DDS波形发生器更多的功能、保真度和灵活性，具有120 MHz的频率、1通道Trueform任意波形，具有排序和64 MSa内存，1 ps抖动（DDS发生器抖动的1/100），比DDS发生器低5倍的谐波失真。

PCI-5421 任意波形发生器  用于生成重复或单次的电波形

PCI-5421 is an arbitrary waveform generator from National Instruments. The PCI-5421 device comes in three versions with three options for on-board memory size. Part number 778692-01 has 8 MB of onboard memory, part number 778692-02 has 32 MB of onboard memory, and part number 778692-03 has 256 MB of onboard memory. The device is used to generate arbitrary waveforms defined by the user. The PCI-5421 device can also generate standard sine, ramp, triangle, and square signals. To accurately generate the waveform, PCI-5421 uses direct digital synthesis (DSS). The device can also be used for streaming data and advanced synchronization.

The PCI-5421 comes with an analog output channel that has an SMB(jack) connector. The DAC resolution of the output channel is 16 bits. It is DC coupled. The output channels of PCI-5421 devices can combine waveforms on similar paths. This means that the device supports waveform summation. Therefore, the output terminals of different modules can be connected. The PCI-5421 waveform generator device has a maximum bandwidth of 43 MHz. The device has a 7-pole elliptical filter.

An arbitrary waveform generator is an electronic test device used to generate repeated or single electrical waveforms. It has a variety of functions, including the generation of sine waves, sawtooth waves, triangular waves and rectangular pulses, and can simulate more complex signal requirements. The core part of arbitrary waveform generator is DDS (Direct Digital Synthesizer), which is composed of two modules through phase accumulation and waveform table lookup, which can produce high-precision and low-distortion signals.

In addition, the PCI-5421 arbitrary waveform generator can also be used to simulate signals necessary in the laboratory to simulate various signal defects and transient signals in the actual circuit, such as overpulse, spikes, damping transients, frequency mutations, etc. These signals may not have been taken into account at the beginning of the circuit design, and if not simulated, could have disastrous consequences.

In order to enhance the ability of waveform generation, arbitrary waveform generator usually relies on computer communication output waveform data. In computer transmission, waveform is generated by special waveform editing software, which is conducive to expanding the capability of the instrument and further simulation and simulation experiment. At the same time, some arbitrary waveform generators built-in a certain number of non-volatile memory, random access to edit waveform, conducive to reference comparison; Or through random interface communication transmission to the computer for further analysis and processing.

The selection of PCI-5421 arbitrary waveform generator needs to consider a number of important parameters, including the highest output frequency of the signal, sampling rate, amplitude range, accuracy, signal quality, arbitrary wave length, etc. For example, Agilent's 33621A arbitrary waveform generator offers more functionality, fidelity, and flexibility than the previous generation DDS waveform generator, with a frequency of 120 MHz, 1-channel Trueform arbitrary waveform, with sorting and 64 MSa memory, 1 ps jitter (1/100 of DDS generator jitter), and more. 5 times lower harmonic distortion than DDS generator.