Digital-to-analog converter

Abstract

The invention provides a digital-to-analog converter comprising a thermometer encoder, a random clock dynamic element matching module and a current source array, wherein the thermometer encoder is used for converting an input digital signal code stream into a thermometer code; the current source array is used for outputting an analog signal; the random clock dynamic element matching module is connected with the thermometer encoder and the current source array and provided with a random clock for generating a random clock signal and a current source channel array for transmitting the thermometer code; and the random clock dynamic element matching module alternates the ranking position of the thermometer code in the current source channel array according to the random clock signal and outputs a thermometer code control signal to the current source array according to the ranking position of the thermometer code. In the digital-to-analog converter, a random clock is introduced by the random clock DEM (dynamic element matching) module, therefore the use of a large quantity of randomized modules is avoided, and the effects of reducing the cost of realizing hardware for a circuit and improving the digital-to-analog conversion efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a digital-to-analog converter. Background technique [0002] With the rapid development of wireless communication technology, especially the continuous emergence of technologies such as 3G / 4G and femtocell, higher requirements have been placed on the performance of analog devices. For a new generation of broadband wireless mobile communications such as IMT-Advanced, the analog baseband performance requires a high sampling rate of more than 100 MS / s and a high precision of 14 bits. Broadband, high-speed, high-precision current-steering digital-to-analog converter (Current-steering DAC) is the core technology for realizing a new generation of broadband wireless mobile communication base station systems. [0003] like figure 1 As shown, the traditional current-steering digital-to-analog converter mainly includes a thermometer encoder and a unit DAC current source array. ...

AI Technical Summary

Problems solved by technology

Although with the development of digital synthesis technology, the DEM algorithm can be implemented in the digital module, but the complexity of the DEM algorithm makes the area and power consumption of the digital module too large

Moreover, the digital module that implements the complex DEM algorithm greatly restricts the conversion speed of the digital-to-analog converter

Therefore, the high-speed DAC applied to the broadband wireless mobile communication base station cannot adopt the traditional DEM algorithm

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