Frequency modulation and demodulation system and signal processing method
A technology of frequency modulation signal and demodulation system, which is applied in the direction of frequency modulation carrier system, modulation carrier system, transmission system, etc. It can solve the problems of large measurement error and insufficient intuitive and accurate judgment of frequency modulation linearity, so as to simplify the hardware circuit and cost, reduce Effect of hardware cost
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[0043] The technical solution of the present invention is further explained in combination with specific embodiments and drawings.
[0044] Such as figure 1 , The frequency modulation demodulation system of the present invention needs to use a variable capacitance diode frequency modulation circuit module, a down-conversion circuit module, a low-frequency digital oscilloscope and an upper computer.
[0045] Such as image 3 , The variable capacitance diode frequency modulation circuit module also includes a combination of a variable capacitance diode and the frequency selection network of the Schiller oscillation circuit of the common base configuration to jointly determine the local oscillator frequency, and provide a static adjustable DC for the variable capacitance diode through a resistor divider Reverse bias voltage, changing the DC bias voltage can change the center frequency and FM sensitivity of the FM signal; the low-frequency modulation signal is input from the cathode of ...
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