The National Instruments PXI-5690, designated as part number 779465-01, is a high-performance PXI RF Amplifier designed to enhance signal testing and monitoring capabilities within RF applications. This programmable module features two channels and operates across a frequency range from 100 kHz to 3.0 GHz. The device provides both fixed and configurable gain options, enabling users to optimize the dynamic range for effective signal analysis on RF Vector Signal Analyzers, such as the NI PXI-5660.

Channel 0 functions as a fixed gain preamplifier, delivering a 30 dB gain with a low noise figure and a flat frequency response, akin to traditional fixed gain amplifiers. Channel 1, in contrast, acts as a programmable preamplifier equipped with two selectable paths. The primary path offers fixed gain amplification accompanied by a step attenuator, adjustable in 1 dB increments, producing an output gain range of -10 to +20 dB. A direct path is also provided, allowing users to bypass the amplifier and attenuator hardware when dealing with higher power inputs to prevent distortion. The PXI-5690 measures 8.5 x 0.8 x 5.1 inches and weighs 9.2 ounces, making it a lightweight and compact solution for diverse RF amplification needs.