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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A multibit sigma-delta ADC for multimode receivers
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A multibit sigma-delta ADC for multimode receivers

机译:适用于多模接收机的多位sigma-delta ADC

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A 2.7-V sigma-delta modulator with a 6-bit quantizer is fabricated in a 0.18-/spl mu/m CMOS process. The modulator makes use of noise-shaped dynamic element matching (DEM) and quantizer offset chopping to attain high linearity over a wide bandwidth. The DEM algorithm is implemented in such a way as to minimize additional delay within the feedback loop of the modulator, thereby enabling the use of the highest resolution quantizer yet reported in a multibit sigma-delta analog-to-digital converter of this speed. The part achieves 95-dB peak spurious-free dynamic range and 77-dB signal-to-noise ratio over a 625-kHz bandwidth, and consumes 30 mW at a sampling frequency of 23 MHz. The part achieves 70-dB signal-to-noise ratio over a 1.92-MHz bandwidth and dissipates 50 mW when clocked at 46 MHz.
机译:具有0.1位量化器的2.7V sigma-delta调制器采用0.18- / spl mu / m CMOS工艺制造。调制器利用噪声形动态元素匹配(DEM)和量化器偏移斩波来在较宽的带宽上实现高线性度。 DEM算法以使调制器的反馈环路内的附加延迟最小化的方式实现,从而可以使用在此速度的多位sigma-delta模数转换器中报告的最高分辨率量化器。该器件在625kHz带宽上达到95dB的无杂散峰值动态范围和77dB的信噪比,并在23MHz的采样频率下消耗30mW的功率。该器件在1.92MHz带宽上达到70dB的信噪比,并以46MHz的时钟频率耗散50mW。

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