With 89S52 single-chip microcomputer and FPGA as the control core, a sweep frequency meter is designed to test the amplitude-frequency characteristics and phase-frequency characteristics of a four-terminal network. The system functions are divided into modules such as sweep frequency signal generation, amplitude-frequency characteristics test, and phase-frequency characteristics test; and the operation part includes a matrix keyboard, a dot-matrix LCD display, and a waveform display circuit. The system can measure the frequency characteristics of a specific frequency point of an unknown network. In addition, the user can also set the upper and lower limits of the sweep frequency signal through the keyboard, and use the oscilloscope to accurately display the amplitude-frequency and phase-frequency curves.
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