This system is based on the principle of zero-IF quadrature demodulator simple frequency characteristic tester for detecting measured amplitude-frequency characteristics and phase-frequency characteristics of the network. The system includes an integrated module DDS, RLC series resonant circuit, multiplier circuit, a low-pass filter, inverting amplifier and measurement display module, which RLC series resonant circuit as a test network. This system DDS Integrated module as the core, which produces orthogonal sweep through the network under test, by the multiplier to obtain a high-frequency signal the two low-pass filtered signal, amplifying get back in line with the requirements of the I, Q DC component Finally, the single-chip ADC Sampling, data processing and liquid crystal display to obtain the measured amplitude-frequency characteristics and phase-frequency characteristics of the network. The innovations in the algorithm is that the beginning of the measure, using short test ne

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