Device and method for generating low-distortion low-frequency sinusoidal signal
A sinusoidal signal, low distortion technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of large frequency jitter and distortion of low-frequency signals, and reduce frequency jitter, distortion, and capacity. Effect
Active Publication Date: 2014-12-31
HANGZHOU DIANZI UNIV
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Problems solved by technology
Compared with the traditional frequency synthesizer, the commonly used DDS (Direct Digital Synthesis) method has the advantages of low cost, high resolution and fast conversion time, but there are large frequency jitter and large distortion when generating low frequency signals. The problem
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[0024] Such as figure 2 As shown, a device for generating a low-frequency sinusoidal signal with low distortion includes a crystal oscillator, a field programmable gate array FPGA, a ROM storage table, and a digital-to-analog conversion DAC; the crystal oscillator provides a clock for the FPGA, and the FPGA receives the clock signal provided by the crystal oscillator and receives the lock Store the externally input frequency word, output the control signal and address information to the ROM storage table through cumulative operation, and store the waveform data amplitude table and waveform data phase table in the ROM storage table, provide the amplitude data and phase data for the FPGA, and the FPGA reads the ROM After storing the data in the table, the control signal of the D / A converter and the data to be converted are output through comparison operation, and the digital-to-analog conversion DAC performs digital-to-analog conversion to output a low-frequency sinusoidal signa...
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The invention discloses a device and a method for generating a low-distortion low-frequency sinusoidal signal, and solves the problems of large frequency jitter and high distortion in the process of generating a low-frequency signal in the prior art. The hardware of the device comprises a crystal oscillator, a field programmable gate array (FPGA), a read only memory (ROM) storage list and a digital / analog (D / A) converter. The method comprises the following steps of: sampling by using an integral point of an amplitude quantized value as a sampling point to acquire sampling point phase value data, and storing the amplitude quantized value of the point; and generating a low-frequency sinusoidal signal by using a hardware platform, generating a clock signal of a frequency word accumulator in an FPGA processing core by using a phase-locked loop (PLL) according to clock input, performing frequency word accumulation operation by using the frequency word accumulator, comparing the current frequency word accumulation value with a phase quantized value of the next sampling point which is to be subjected to D / A conversion to control D / A conversion and read data in an ROM, and acquiring the required low-frequency sinusoidal signal at the output end of the D / A converter. By the device and the method, the frequency jitter of the generated waveform is reduced, and the distortion and the capacity of a waveform memory are reduced.
Description
technical field [0001] The invention relates to the field of instruments and meters, in particular to a device and method for generating a low-distortion low-frequency sinusoidal signal. Background technique [0002] With the rapid development of science and technology, low-frequency sinusoidal signals are widely used in modern communication, scientific research and electronic industries, and the accuracy and stability of the signal generator determine the working status of the entire system performance. Traditional analog signal generators can no longer meet the objective requirements. With the rapid development of digital integrated circuits, digital signal generators have been greatly developed. A digital signal source is usually used to generate a low-frequency sinusoidal signal, and its output amplitude, frequency and phase have good time stability and are easy to debug and control. Compared with the traditional frequency synthesizer, the commonly used DDS (Direct Digi...
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IPC IPC(8): H03L7/085H03L7/18
Inventor 黄继业高明煜邹宏何志伟王文皓
Owner HANGZHOU DIANZI UNIV