NI PCI-5911 High-Speed Digitizer Card

The NI PCI – 5911 is a high – speed digitizer card developed by National Instruments (NI), a leading name in the field of test, measurement, and automation solutions. This card is designed to be installed in a PC’s PCI slot, enabling users to digitize high – frequency analog signals with remarkable precision and flexibility.

With its single flexible resolution channel, the NI PCI – 5911 can operate at 8 bits with a sampling rate of 100 MS/s for high – speed, wide – bandwidth applications, or it can switch to 21 – bit resolution at a lower sampling rate of 10 KS/s for scenarios that demand higher precision in measuring low – frequency or slow – changing signals. The 100 MHz bandwidth ensures that it can accurately capture and digitize signals across a broad range of frequencies, making it suitable for a wide variety of applications.

The integrated waveform memory, available in 4 MB or 16 MB capacities with multi – record capture mode, provides sufficient storage for acquired data. The card’s ability to perform both real – time sampling at 100 MS/s and random – interleaved sampling at 1 GS/s (for repetitive signals in conventional mode) further enhances its versatility, allowing it to meet the requirements of different types of signal acquisition tasks.

Detailed parameter table

Core advantages and technical highlights

Flexible Resolution and Sampling Rates

The NI PCI – 5911 stands out with its unique ability to offer variable resolution and sampling rates. In conventional mode, it functions as an 8 – bit, 100 MHz digitizer, capable of real – time sampling at 100 MS/s and random – interleaved sampling at 1 GS/s for repetitive signals. This is extremely useful for applications such as high – speed data acquisition in communication systems, where capturing fast – changing signals accurately is crucial.

When dealing with signals having a bandwidth less than 4 MHz, the flexible – resolution mode comes into play. Using patented signal processing technology, this mode extends the effective resolution beyond 8 bits. The ADC circuitry acts as a multibit sigma – delta converter, sampling the signal at 100 MS/s. A noise – shaping circuit then moves quantization noise from lower to higher frequencies. After that, the data is linearized to a precision of 21 bits in a DSP, and a digital low – pass filter (which also serves as an anti – alias filter) removes the high – frequency noise. Finally, the data is resampled at a lower rate with a higher effective resolution. This flexibility allows for high – precision measurements in applications like sensor calibration, where accurate measurement of low – level signals is required.

Low Noise and Distortion Performance

The NI PCI – 5911 is engineered to provide low noise and low distortion performance. Whether it’s capturing transients, analyzing spectra, recording waveforms, or digitizing intermediate frequency signals (IFs), this digitizer ensures that the acquired data is of high quality. Low noise is particularly important in applications such as semiconductor test and component characterization. In semiconductor test, for example, when measuring the electrical characteristics of a microchip, any additional noise from the digitizer could lead to inaccurate readings and misinterpretation of the chip’s performance. The low distortion feature also guarantees that the digitized signal faithfully represents the original analog signal, which is essential for accurate signal analysis in research and development scenarios.

Scatter – Gather Capability

This digitizer capitalizes on the scatter – gather capability, which enables data rates faster than traditional interfaces like RS – 232 and GPIB. This feature has a significant impact on overall test time. In high – throughput test systems, where large amounts of data need to be transferred quickly between the digitizer and the host computer, the scatter – gather capability of the NI PCI – 5911 allows for more efficient data transfer. For instance, in an automated test system for electronic components, the faster data transfer rate reduces the time required to acquire and analyze data from each component, thereby increasing the overall productivity of the test system.

Advanced Clock Generator for Synchronization

The NI PCI – 5911 is equipped with a 100 MHz advanced clock generator. This feature is crucial for applications that require synchronization of multiple devices. In a multi – channel data acquisition system, for example, where several digitizers need to work in unison to capture different aspects of a complex signal, the advanced clock generator ensures that all the devices are precisely synchronized. This synchronization is essential for accurate signal reconstruction and analysis. In a radar system test, where the digitizer needs to synchronize with other instruments such as signal generators and analyzers, the 100 MHz clock generator enables seamless coordination, leading to more reliable test results.

Typical application scenarios

Component Characterization

In the field of component characterization, the NI PCI – 5911 is used to accurately measure the electrical properties of various electronic components. For example, when characterizing a high – speed amplifier, the digitizer can capture the amplifier’s output signal with high precision. The flexible resolution and sampling rates allow engineers to measure the amplifier’s gain, bandwidth, and distortion characteristics over a wide range of frequencies. The low noise and distortion performance of the NI PCI – 5911 ensure that the measured values accurately represent the true performance of the amplifier, without being affected by additional noise or distortion introduced by the measurement equipment.

Semiconductor Test

Semiconductor manufacturers rely on the NI PCI – 5911 for a variety of semiconductor test applications. When testing integrated circuits (ICs), the digitizer can be used to capture and analyze the electrical signals on the IC’s pins. The high – speed sampling capabilities are useful for testing high – speed serial interfaces in ICs, ensuring that the data transmission rates and signal integrity meet the required standards. In addition, the flexible – resolution mode can be used to measure the low – level signals associated with the leakage currents in semiconductor devices, which is crucial for evaluating the quality and reliability of the ICs.

Electronic Test

In general electronic test applications, the NI PCI – 5911 can be used to troubleshoot and debug electronic circuits. For example, in a printed circuit board (PCB) assembly line, the digitizer can be used to capture the signals on the PCB to identify any faulty components or incorrect signal traces. The ability to quickly capture and analyze signals using the high – speed sampling rates and the multi – record capture mode of the NI PCI – 5911 helps in reducing the time required to diagnose and fix problems, thereby improving the overall efficiency of the production process.

Video Test

The 100 MHz bandwidth of the NI PCI – 5911 makes it suitable for video test applications. When testing video signal processing components or systems, the digitizer can capture and analyze the video signals. For example, it can be used to measure the timing characteristics, signal levels, and distortion of analog video signals. In digital video systems, the NI PCI – 5911 can be used to capture and analyze the digital video data streams, ensuring that the video quality meets the required standards. The low noise and distortion performance are also important in video test applications, as any additional noise or distortion could affect the visual quality of the video.

Installation preparation

Before installing the NI PCI – 5911, power off the PC and ensure that it has an available PCI slot that is compatible with the card. It is recommended to wear an electrostatic discharge (ESD) wristband to prevent any electrostatic damage to the card during installation. Insert the NI PCI – 5911 card firmly into the PCI slot and secure it with the appropriate chassis screw.

Connect the necessary cables to the front panel connectors of the card. The BNC and SMB connectors can be used to connect analog signal sources or measurement devices, depending on the application. The 9 – pin mini – circular DIN connector may be used for specific functions such as triggering or synchronization, depending on the setup.

Download and install the latest version of the NI – SCOPE driver software from the NI website. This software is essential for the proper functioning of the card and for communicating with other software applications. After installing the driver, use NI’s Measurement & Automation Explorer (MAX) to verify that the card is detected correctly. In MAX, you can also perform a self – test on the card to ensure that it is working properly.