The invention relates to a vector
signal source plug-in card-type structural module based on a PCI extension for
instrumentation (PXI)
bus, which comprises a PXI interface circuit 1, a
baseband signal generating circuit 2, a digital-to-analogue conversion circuit 3, a
frequency synthesis circuit 4, an in-phase quadrature (IQ) vector modulation circuit 5 and an
adaptive logic circuit (ALC) control and vector
signal source output circuit 6 which are combined with an external plug-in card E to form a modular
structural integrity. According to the
software radio technology and the modular structural design principle of an
integrated circuit, a
mathematical model is established; a
microwave and a high-speed digital
processing chip are adopted to set required vector
signal source frequency, amplitude and power to perform real-time calculation to generate modulation output. Technologically, the optimal shielding, grounding, decoupling, filtering and leakage prevention optimization design is adopted to realize the characteristics of reasonable
layout, compact structure, skillful installation, wide expansibility, high adaptability, high reliability and the like, and the requirements of
automatic testing and analysis of a traditional digital communication
system are completely met, and the need of the development of the communication technology is adapted.