Platform and method for improving sampling rate of DAC

Abstract

The invention discloses a platform and method for improving DAC sampling rate, the platform comprises a data decomposition unit, a DAC chip I, a DAC chip II, a clock management module and a power combiner, the method comprises the following steps: firstly decomposing an input signal into two independent signal sequences by using the data decomposition unit; the two signal sequences are input intotwo DAC chips working in a conventional mode and a frequency mixing mode respectively, different compensation is conducted on the signal sequences input into the two DAC chips according to the inconsistency of the output amplitudes of the two chips, and finally output signals of the two DAC chips are synthesized and output through a power synthesizer. The clock management module provides a sampling clock and a reference clock for the two DAC chips. According to the platform and method for improving the DAC sampling rate, the real-time sampling rate of the DAC chip is doubled, a new technical route is provided for improving the DAC sampling rate, the method is remarkable in effect, and the platform is simple in structure and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of DAC synthesis and conversion, and in particular relates to a platform for improving the sampling rate of a DAC and a method thereof. Background technique [0002] High-speed DAC is the key to realize high-speed playback of data. Currently, the number of DACs that can work at higher sampling frequencies is small and expensive, and further increasing the sampling rate of DACs also faces great challenges. In recent years, due to factors such as technological blockade, it is difficult to obtain high-end DAC devices in China. Faced with such a difficult situation, it is very important to break through the technical bottleneck that it is difficult to increase the DAC sampling rate to improve the application level of DAC chips in my country. [0003] At present, there are two main methods for increasing the sampling rate of DACs: a high-speed switching-based DAC synthesis method and an alternate time DAC synthes...

AI Technical Summary

Problems solved by technology

Take two DAC chips as an example. When synthesizing two DAC chips, the DAC synthesis method based on high-speed switches needs to ensure that the switching frequency of the electronic switch is twice the sampling clock of the DAC chip. This method has disadvantages The reason is that when the switching frequency of the electronic switch continues to increase, the clock jitter will have a great impact on the duty cycle of the electronic switch, and it is difficult to obtain an electronic switch with a high switching frequency; the DAC synthesis method based on alternating time requires two chips The clock of the DAC chip must have a fixed phase difference, so as to avoid the problem of inaccurate output of the synthesized signal. However, it is difficult to guarantee a fixed phase difference in practice.

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