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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A CMOS oversampling D/A converter with a current-mode semidigital reconstruction filter
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A CMOS oversampling D/A converter with a current-mode semidigital reconstruction filter

机译：具有电流模式半数字重构滤波器的CMOS过采样D / A转换器

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摘要

Oversampling digital-to-analog (D/A) converters employing sigma-delta modulation noise shaping and single-bit quantization are attractive for use in digital audio applications because of their relaxed reconstruction filtering requirements and their tolerance of component mismatch. However, the use of a two-level D/A interface results in a large amount of out-of-band quantization noise that typically must be attenuated by a carefully designed analog reconstruction filter. This paper introduces a means of simplifying the reconstruction filter design through the use of a semidigital finite-impulse-response (FIR) filter. In particular, it describes an oversampling D/A converter wherein a current-mode semidigital reconstruction filter is used to implement a multilevel D/A interface that attenuates the out-of-band quantization noise without requiring precise component matching. An experimental implementation of the converter achieves a dynamic range of 94 dB and 72 dB attenuation of out-of-band quantization noise for a baseband of 20 kHz. The prototype converter, which consists of a linear interpolator, a second-order noise shaper, and a 128-tap semidigital FIR filter, dissipates 59 mW from a 5-V supply and occupies an active area of 3 mm/sup 2/ when integrated in a 1.2- mu m digital CMOS technology.
机译：采用sigma-delta调制噪声整形和单位量化的过采样数模（D / A）转换器因其宽松的重构滤波要求和对组件失配的容忍度而吸引了数字音频应用。但是，使用两级D / A接口会导致大量带外量化噪声，通常必须通过精心设计的模拟重建滤波器来衰减这些噪声。本文介绍了一种通过使用半数字有限冲激响应（FIR）滤波器简化重构滤波器设计的方法。特别是，它描述了一种过采样D / A转换器，其中电流模式半数字重构滤波器用于实现多级D / A接口，该接口可衰减带外量化噪声而无需精确的组件匹配。该转换器的实验实现方式为20 kHz的基带实现了94 dB的动态范围和带外量化噪声的72 dB衰减。原型转换器由线性内插器，二阶噪声整形器和128抽头半数字FIR滤波器组成，从5V电源耗散59 mW，集成时占用3 mm / sup 2 /的有效面积。采用1.2微米数字CMOS技术。

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