Time interleaving random waveform synthesis device and method based on DA zero-return-hold function

Abstract

The invention discloses a time interleaving random waveform synthesis device and method based on DA zero-return-hold function. The method comprises the steps that based on a user's waveform parameter setting, a random waveform data is generated, through the calculation of a sampling rate and a vertical resolution, the data reading speed is acquired, based on the reading speed, reading the waveform data to acquire a DDS waveform data, transmitting the data of the sampling points of even numbers of the DDS waveform data to a first DA chip applying the zero-return-hold function, transmitting the data of the sampling points of odd numbers to a second DA chip applying the zero-return-hold function, two lines analog signals output from DA chip undergo the impedance matching, precision delay adjustment and signal overlay to achieve the vector overlay of two lines of analog signals; the overlaid analog signals are filtered and controlled in amplitude to acquire an output waveform. The method and device use the overlaying of the output signals of two DA zero-return-hold functions which is equal to the output signal of a DA zero order preserving function with two times of the sampling rate, thus causing no other amplitude and phase variants, needing no compensation, and enhancing 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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