Device and method for generating multi-channel sine wave phase standard signals

Abstract

The invention relates to a device and a method for generating multi-channel sine wave phase standard signals and belongs to the technical field of electronics. The device comprises two or more filter and amplification circuits, two or more digital-to-analog conversion circuits, two or more waveform memories, a logic control circuit, an address counter, a computer, a human-machine interface circuit and a clock circuit, wherein the number of filter and amplification circuits, the number of digital-to-analog conversion circuits and the number of waveform memories are the same; and the filter andamplification circuits, the digital-to-analog conversion circuits and the waveform memories are correspondingly matched with one another one by one. The device is stable and reliable and high in resolution and is not influenced by factors such as noise, distortion and the like, and can generate multi-channel sine wave phase standard signals with adjustable phase differences among channels, and drifting is avoided; the common address counter and the control logic circuit avoid influences of factors such as time base distortion, time base dithering, synchronous time delay error and the like on the phase difference; and the device has the characteristic that phase difference values can be reproduced at high precision.

Description

technical field [0001] The invention relates to a device and a method for generating a multi-channel sine wave phase standard signal, in particular to a device and a method capable of generating a multi-channel sine wave phase standard with an arbitrarily adjustable phase difference between channels, and belongs to the technical field of electronics. Background technique [0002] Phase difference measurement and reproduction technology is one of the basic technologies in the field of electronic metrology, which is of great significance and far-reaching influence. For example, the power factor in AC electric energy metering test needs to measure the phase difference between two-phase or three-phase AC voltage and between voltage and current to be finally determined, and the time difference measurement in many occasions is obtained indirectly through phase difference measurement, so The determination and reproduction of phase standards has always been a basic problem in this f...

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Problems solved by technology

In the past, the means of generating high-precision phase difference signals by controlling delay time, controlling trigger synchronization characteristics, and using passive delay networks have achieved good results, but they have been affected by amplitude factors such as circuit drift, noise, and waveform distortion, and Due to the influence of time factors such as circuit time base distortion, time base jitter, and synchronization delay error, it is difficult to achieve very high accuracy. In the case of output, higher accuracy can be obtained, but high-resolution phase adjustment fineness cannot be obtained, and the value is fixed and cannot be adjusted; 2) Using the principle of arbitrary wave generator to generate phase difference can have higher resolution and adjustment fineness , but it also needs to generate phase difference through delay and synchronization. The resolution is limited by the sampling interval. It only has high resolution at low frequency, and it is not easy to produce high resolution at high frequency; 3) single-point synchronization circuit is susceptible to level noise at the synchronization point , signal distortion, and level drift factors will reduce the accuracy of the phase difference value

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