DDS infinite frequency hopping method and system
A technology of frequency and multiplier, which is applied in the DDS infinite frequency hopping method and system field, can solve the problems of increased circuit area and the inability to realize infinite and arbitrary frequency hopping, and achieve the effect of reducing power consumption and saving computing resources
Active Publication Date: 2021-07-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0004] The main purpose of the present invention is to solve the technical problem that in the prior art, DDS can only switch between a limited number of frequencies; the more frequencies need to be switched, the circuit area will rise linearly; the technical problem that unlimited and arbitrary frequency hopping cannot be realized
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[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0047] In the prior art, the traditional DDS can be divided into two parts, a phase accumulator module and a phase-amplitude conversion module; the phase accumulator module can generate the phase of the current local oscillator signal, and the phase-amplitude conversion module completes the mapping of cos / sin values; First, you need to input a frequency control word (FTW) to determine the frequency of the sine wave. The specific formula is:
[0048] f c =(FTW×f s ) / 2 n (1)
[0049] where f c is the desired frequency, f s is the sampling rate, n is the bit width; obtain the desired frequency control word FTW, and accumulate the phase values at different times under each clock; but there is a problem here, when the frequency is converted, the phase accumulator in the system The module will not be cleared ...
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The invention relates to the field of DDS frequency hopping, and provides a DDS infinite frequency hopping method. The method comprises the following steps: acquiring a frequency control word FTW and an initial phase pow, and acquiring a time count t through a counter; inputting the frequency control word FTW and the time count t into a multiplier for calculation to obtain a current frequency FTW * t; adding the current frequency FTW * t and the initial phase pow to obtain a current output parameter acc; inputting the current output parameter acc into a phase-amplitude conversion module, and obtaining a current output sine wave through a three-section cordic algorithm. The multiplier is introduced to replace a traditional accumulator, the infinite frequency hopping function which cannot be achieved by a traditional DDS is achieved, and phase coherence after last reset is guaranteed; the multiplier adopts step-by-step multiplication, a frequency control word FTW and a time count t are equally divided into six parts, and all the corresponding parts are multiplied in sequence and then added, so that computing resources are saved; and a gated clock is introduced to reduce power consumption and further optimize.
Description
technical field [0001] The present invention relates to the field of DDS frequency hopping, in particular to a DDS infinite frequency hopping method and system. Background technique [0002] In the traditional design, the phase accumulation module in the DDS is implemented using an accumulator. If frequency hopping is required, many accumulators are needed to implement it. In such a structure, the frequency hopping signal can also be output, and only need to increase A series of parallel accumulators accumulate multiple FTWs at the same time; multiple parallel accumulators do not affect each other, each accumulator has its own FTW, and cos / sin of multiple frequencies can still be obtained; it can also be completed The requirements for switching frequency and synchronous work; it can simply realize the jump between a limited number of frequencies. In actual work, only need to input multiple FTWs at the beginning to determine the state of all accumulators through the initial s...
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IPC IPC(8): H03L7/16
CPCH03L7/16
Inventor 刘明雄姚亚峰付东兵
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)