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is automatically associated according to the reference level or manually set by the user to provide the appropriate
mixer level. The switch filtering and frequency conversion part is used for band filtering and frequency conversion of
RF input signals and output of IF signals to the IF channel board.
The IF channel board is used for filtering IF signal input of the frequency conversion module. Gain control is
implemented based on bands so as to adjust the amplitude of AD sample signals and finally output differential
digital signals to FPGA after AD conversion, so as to achieve the functions of digital down-conversion, IF filtering,
video filtering, etc.
The CPU board includes the power conversion and management circuit, interface and display circuit, FPGA/CPLD
control and digital signal processing circuit and ARM core module, and is used for DC/DC conversion and operation
management of the power supply of the whole instrument, digital signal processing, logic circuit control, etc. Finally,
digital signals in the sweep curve, spectrogram and other forms, as test results are transmitted to the LCD display.
The frequency synthesizer board has the function of providing 10MHz reference input/output for the outside, with
the internal reference ring output signal as the LO frequency reference, and also providing high-stability clock
signals for AD sampling and FPGA. The LO generation circuit is used for providing LO signals for the mixer in the
microwave MMW frequency conversion module, and related to the hardware sweeping speed, phase noise,
sideband emission and other indicators of the whole instrument.