Direct digital frequency synthesis (DDS)-based signal source
A technology of digital frequency synthesis and signal source, applied in the direction of logic circuits using basic logic circuit components, logic circuits using specific components, etc., can solve the problems of crystal reference frequency source difficulty, complex cost, high cost, large parasitic output, etc.
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[0011] The invention includes a system including a phase-locked loop clock circuit, a key debounce interface circuit, a control system, a DDS module circuit and the like. The present invention realizes DDS to generate digital signal through FPGA, converts into the sine wave with frequency at 30-100Hz and phase at 0-360 degrees continuously adjustable by D / A converter, and the control system uses the NiosII system of Altera Company to make the whole system The core part is completed on an FPGA chip.
[0012] After the frequency control word is accumulated by the phase accumulator, it is accumulated with the phase control word to generate a cycle of sine wave address information. The sign bit is not synchronized with the data generated after the ROM lookup table, so a delay register is needed to ensure the output data. correctness.
[0013] According to the requirements of the system, the button interface and liquid crystal interface, frequency and phase control word output are...
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