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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A 64-MHz clock-rate ΣΔ ADC with 88-dB SNDR and -105-dB IM3 distortion at a 1.5-MHz signal frequency
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A 64-MHz clock-rate ΣΔ ADC with 88-dB SNDR and -105-dB IM3 distortion at a 1.5-MHz signal frequency

机译:一个64MHz时钟速率ΣΔADC,在1.5MHz信号频率下具有88dB的SNDR和-105dB的IM3失真

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摘要

A 64-MHz clock rate sigma-delta (ΣΔ) analog-to-digital converter (ADC) with -105-dB intermodulation distortion (IMD) at a 1.5-MHz signal frequency is reported. A linear replica bridge sampling network enables the ADC to achieve high linearity for high signal frequencies. Operating at an oversampling ratio of 29, a 2-1-1 cascade with a 2-b quantizer in the last stage reduces the quantization noise level well below that of the thermal noise. The measured signal-to-noise and distortion ratio (SNDR) in 1.1-MHz bandwidth is 88 dB, and the spurious-free-dynamic-range (SFDR) is 106 dB. The modulator and reference buffers occupy a 2.6-mm2 die area and have been implemented with thick oxide devices, with minimum channel length of 0.35 Μm, in a dual-gate 0.18-Μm 1.8-V single-poly five-metal (SP5M) digital CMOS process. The power consumed by the ADC is 230 mW, including the decimation filters.
机译:报道了在1.5MHz信号频率下具有-105dB互调失真(IMD)的64MHz时钟速率sigma-delta(ΣΔ)模数转换器(ADC)。线性复制桥采样网络使ADC能够针对高信号频率实现高线性度。以29的过采样率运行时,最后一级的2-1-1级联和2-b量化器将量化噪声级别降低到远低于热噪声的水平。在1.1 MHz带宽中测得的信噪比(SNDR)为88 dB,无杂散动态范围(SFDR)为106 dB。调制器和参考缓冲器占据2.6mm2的管芯面积,并已用双通道0.18μm,1.8V单多晶硅五金属(SP5M)数字器件,最小沟道长度为0.35μm的厚氧化物器件实现。 CMOS工艺。 ADC消耗的功率为230 mW,包括抽取滤波器。

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