Device and method for synthesizing time-domain interleaved arbitrary waveforms based on da return-to-zero-hold function

Abstract

The invention discloses a time-domain interleaved arbitrary waveform synthesis device and method based on a DA return-to-zero hold function. According to user waveform parameter settings, arbitrary waveform data is generated, and the data reading speed is obtained by calculating the sampling rate and vertical resolution. According to the reading Read the waveform data at a high speed to obtain the DDS waveform data; transfer the even sampling point data of the DDS waveform data to the first DA chip using the zero-hold function, and transmit the odd-number sampling point data to the second DA using the zero-hold function Chip, the analog signals output by the two DA chips are subjected to impedance matching, precise delay adjustment and signal superposition to realize the vector addition of the two analog signals; the added analog signals are filtered and the signal amplitude is controlled to obtain the output waveform. The present invention adopts the superposition of signals output by two DA zero-returning and holding functions, which is equivalent to the output signal of the DA zero-order holding function with twice the sampling rate, does not introduce other amplitude and phase variables, does not need compensation, and improves the sampling rate.

Description

technical field [0001] The invention relates to a time-domain interleaved arbitrary waveform synthesis device and method based on a DA return-to-zero hold function. Background technique [0002] High-speed arbitrary waveform generation technology is a signal generation technology based on digital, analog and computer technology. It is widely used in radar, satellite communication, electronic countermeasures, radio frequency testing, integrated circuit testing and other fields. High-speed arbitrary waveform generation technology has become a modern electronic Research hotspots in the field of technology. The high-speed arbitrary waveform generator based on this technology has the advantages of high output frequency stability and resolution, fast frequency switching speed, and continuous output waveform phase when switching. Its rich signal excitation capabilities include high-speed waveform generator, function generator generator, pulse / sequence generator, frequency sweep ge...

AI Technical Summary

Problems solved by technology

The superimposed output signal can break through the limitation of single-channel DA sampling rate and bandwidth, realize the improvement of sampling rate, but also change the amplitude and initial phase of waveform data

[0004] Some existing high-speed arbitrary waveform generators use the interpolation waveform synthesis method, which has high requirements on the switching time, jitter noise and service life of the switching circuit, and has great limitations in high-frequency applications

Some other high-speed arbitrary waveform generators use a time-domain interleaved waveform synthesis method based on the DA zero-order hold function. This method needs to add amplitude and phase correction factors to the waveform data, and the operation is complicated.

At the same time, the DA zero-order hold function attenuates the spectral envelope of the output signal faster, and cannot reach 40% of the waveform sampling rate without compensation.

In addition, the above two methods have no measures to reduce the offset of the DA analog signal, and cannot guarantee the quality of the output signal

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