Dynamic Element Matching Encoder

Abstract

The present invention proposes a dynamic component matching encoder, which is characterized in that it includes: an input module that provides an n-bit binary number B, where B=BnBn-1...B2B1, and 0≤B≤2n-1; n levels Encoder, the n-level encoder is used to encode the binary number B, wherein, each level of the n-level encoder includes a data replicator and a random selector, and the k-th encoder includes a 2k‑1 bit data replica device and a 2k-1 bit random selector, wherein the 2k-1 bit data duplicator is used to copy each bit of a 1-bit binary number to obtain a 2k-1 bit binary number output, and the 2k-1 bit random selector is used In order to randomly select and recombine the bits of two 2k-1-bit binary numbers to obtain a 2k-bit binary number output, the encoder obtains 2n 1-bit binary number outputs through n-level data replication and random selection, where k=1 ,2,...,n. The invention has the advantages of simple structure, low complexity and high degree of randomization.

Description

technical field [0001] The invention relates to the technical field of digital-to-analog conversion circuits, in particular to a dynamic element matching encoder. Background technique [0002] With the continuous development of signal processing technology and communication technology, the interface technology between digital signal and analog signal has become the bottleneck restricting the digital-analog hybrid system. In order to meet the high-speed and high-precision data conversion requirements, digital-to-analog converters and analog-to-digital converters need to achieve the highest possible speed and accuracy. In modern high-speed digital-to-analog converters, the current-mode digital-to-analog converter has become the preferred structure of engineers because it can directly drive resistive loads and has a relatively fast operating speed. [0003] The structure of the common current-mode digital-to-analog converter is as attached figure 1 As shown, it mainly include...

AI Technical Summary

Problems solved by technology

When the precision of the DAC is high, that is, when n is large, the implementation complexity of the ideal DEM encoder increases exponentially with the precision, which brings serious problems of power consumption, area and design complexity

[0007] To this end, Galton et al. proposed a segmented DEM method (DynamicElement Matching to Prevent Nonlinear Distortion From Pulse-Shape Mismatches in High-Resolution DACs published on JSSC in 2008), which can reduce the complexity of the DEM encoder to a certain extent, but its mathematical The derivation and specific implementation are still relatively complicated

Wei-Te Lin et al. proposed a dynamic component matching method based on "circular displacement of random bits" (A Compact Dynamic Performance Improved Current-SteeringDAC With Random RotationBasedBinaryWeighted Selection published on JSSC in 2012), which realizes encoding by shifting random bits through control signals The randomization of the device, this method is relatively simple to implement, but it is not completely random coding, so the performance will be affected

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