The National Instruments 781216-01, also known as the PXIe-5651 PXI RF Analog Signal Generator, is designed for advanced communication system testing and general-purpose RF applications. This high-performance module operates within a frequency range of 500 kHz to 3.3 GHz and provides fine frequency resolution, with increments as small as 3 Hz for frequencies up to 1.3 GHz and more than 6 Hz for higher frequencies. The generator utilizes an internal reference clock, ensuring an initial frequency accuracy of ±3 parts per million and a maximum aging rate of ±5 parts per million per year. It achieves low single sideband phase noise of -111 dBc/Hz at a 10 kHz offset from a 100 MHz carrier, contributing to superior signal integrity.

The amplitude control functionality offers a resolution of less than 0.1 dB, with output levels ranging from -90 dBm to 10 dBm, based on the frequency context. Amplitude accuracy is specified at ±0.75 dB for output powers exceeding -40 dBm and within ±1.8 dB for lower power outputs, thus enhancing reliability in amplitude management. The PXIe-5651 supports various modulation schemes, including frequency modulation (FM), frequency shift keying (FSK), and on-off keying (OOK), with FM deviations ranging from 125 kHz to 4 MHz, and FSK and OOK deviations spanning from 31.25 kHz to 1 MHz, making it a versatile choice for intricate RF signal generation. Operating within a temperature range of 0°C to 55°C, this module is designed to meet the rigorous demands of industrial environments. Its dimensions are 2.0 cm x 13.0 cm x 21.6 cm, illustrating a compact form factor suitable for PXI systems.