一个0.25 mW 13 b无源/spl Sigma//spl Delta/调制器,用于10 MHz中频输入

Feng Chen, B. Leung
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引用次数: 6

摘要

结合/spl Sigma//spl Delta/调制器与混频器实现单步频率转换和A/D转换,简化模拟电路并节省功耗。进一步的功率效率可以通过带无源环路滤波器的/spl Sigma//spl Delta/调制器来实现。由于这涉及到直接转换,无论环路滤波器的极点位置如何,信号总是混合到直流电,因此量化噪声功率谱密度的零位置对寄生不敏感。内置无源混频器的无源开关电容调制器数字化10mhz中频信号。由于无源环路滤波器中缺乏增益,仅开关增益-升压网络无需使用有源电路即可提供增益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A 0.25 mW 13 b passive /spl Sigma//spl Delta/ modulator for a 10 MHz IF input
Combining /spl Sigma//spl Delta/ modulator with mixing achieves frequency translation and A/D conversion in a single step, simplifying analog circuitry and saving power. Further power efficiency can be achieved by a /spl Sigma//spl Delta/ modulator with a passive loop filter. Because this involves direct conversion, the signal is always mixed down to dc irrespective of the pole locations of loop filter and therefore the null position of the quantization noise power spectrum density is insensitive to the parasitics. A passive switched-capacitor modulator with a built-in passive mixer digitizes a 10 MHz IF signal. Due to the lack of gain in the passive loop filter, a switch-only gain-boost network provides gain without using active circuitry.
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