Multichannel random waveform editing device and method

An arbitrary waveform and multi-channel technology, applied in the direction of instruments, electrical digital data processing, digital data processing components, etc., can solve the problems of low pulse width adjustment resolution, pulse width error, and unstable frequency of synthesized signals, etc., to achieve Solve the effect of low pulse width adjustment resolution and eliminate frequency and pulse width errors

Inactive Publication Date: 2017-05-31
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing DDS technology to generate a composite signal has the advantages of low cost, low power consumption and fast conversion time, etc., but the pulse width adjustment resolution of the high-speed pulse wave is not high under the existing DDS technology. When the relationship between the sampling rate and the frequency of the composite signal When it cannot be divisible, the frequency of the synthesized signal will be unstable, especially when generating high-speed square wave and pulse wave signals, the pulse width will have an error of one sampling clock cycle

Method used

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  • Multichannel random waveform editing device and method
  • Multichannel random waveform editing device and method
  • Multichannel random waveform editing device and method

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Embodiment 1

[0030] Such as figure 1 As shown, this embodiment takes the high-speed DAC sampling rate of 2.5GHz as an example to describe the high-speed waveform data synthesis principle of the 16-channel DDS concurrent structure:

[0031] The 2.5GHz sampling high-speed DAC performs analog-to-digital conversion on the high-speed data stream, and at the same time divides the sampling clock to obtain a frequency-divided clock of 625MHz, which is sent to the global clock pin of the FPGA as the global system clock of the FPGA, and then divides it. Frequency and phase-lock processing to get a stable clock signal of 156.25MHz.

[0032] Assuming that each DDS frequency synthesis channel is P0, P1, P2, ..., P14, P15 respectively, and they are all N if they are not as identical as possible, and P is the common initial phase of multiple DDS signals, then by adjusting the step amount N, that is The output signal frequency can be adjusted, and the initial phase of the signal can be adjusted by adjust...

Embodiment 2

[0036] Such as figure 2 As shown, the multi-channel arbitrary waveform editing device of this embodiment includes multiple DDS frequency synthesis channels set in parallel, and this embodiment describes the principle of each DDS frequency synthesis channel:

[0037] Each DDS frequency synthesis channel in this embodiment includes a parameter configuration calculation unit 101 , a parameter fixation and transfer unit 201 , a waveform editing and synthesis unit 301 and a signal conditioning unit 401 .

[0038] The parameter configuration calculation unit 101 is set in the host computer, and is used to select the waveform output type and configure waveform parameters, the waveform parameters include pulse wave rise time, fall time, pulse width and signal frequency.

[0039] Parameter fixed-point and transfer unit 201 utilizes DSP to make configuration parameters fixed-point, and calculates the time-varying frequency control word needed for rising edge data, high level data, fall...

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Abstract

The invention relates to the technical field of tests, in particular to a multichannel random waveform editing device. The multichannel random waveform editing device comprises a DDS frequency synthesis channel arranged in a multichannel parallel mode, each channel of the DDS frequency combining channel comprises a parameter configuration calculation unit, a parameter fixed-point and transfer unit, a waveform editing synthesis unit and a signal conditioning unit. A wireless technology is adopted, a waveform sequence is edited on a PC terminal, parameter calculation is conducted in the DSP, parallel transmission and waveform control are conducted on an FPGA, occurrence of multiple regular and irregular waveform signals can be achieved, an improved type DDS technology is adopted, the frequency and pulse width error are drastically eliminated, and the problem that the existing DDS technology that the pulse width adjusting resolution is not high is solved.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a multi-channel arbitrary waveform editing device and method. Background technique [0002] Arbitrary waveform generator (hereinafter referred to as AWG) is a multi-purpose signal excitation source. Its rich signal excitation capabilities include function generator, pulse / pulse train generator, frequency sweep generator, trigger generator, broadband White noise signal generator and amplitude modulation source, etc. It has a serial address control function, can generate broadband digital modulation signals and complex analog modulation signals, etc., and has the characteristics of high integration and high technical difficulty. [0003] Arbitrary waveform generators generally use direct digital synthesis (DDS) technology to realize arbitrary waveform generation and output. The quality of the generated signal is determined by factors such as high-speed D / A sampling rate, vertical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/03
CPCG06F1/0321
Inventor 白云鹏朱勇锋周生奎
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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