Binary frequency shift keying modulation system
A frequency shift keying and modulation system technology, applied in the field of communication, can solve problems such as poor flexibility, low spectrum utilization, discontinuous modulation carrier phase, etc., and achieve the effect of narrow occupied bandwidth and continuous carrier phase
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[0021] specific implementation plan
[0022] The system will be further described below in conjunction with the accompanying drawings.
[0023] Such as figure 1 As shown, the binary frequency shift keying (2FSK) modulation system is characterized in that it is composed of an FPGA chip, a frequency synthesis chip and a low-pass filter. It adopts the direct frequency synthesis (DDS) method and uses a field programmable chip (FPGA ) is directly connected to the frequency synthesis chip, and configures the frequency tuning word of the frequency synthesis chip through the control bus, and then outputs a binary frequency shift keying (2FSK) modulation signal through a low-pass filter;
[0024] FPGA chip adopts FPGA chip SPARTAN-6 of Xilinx Company.
[0025] The frequency synthesis chip adopts the frequency synthesis chip AD9851 of AD Company.
[0026] The FPGA chip uses a 100MHz system clock, and its internal digital clock management module divides the 100MHz system clock to 30MH...
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