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首页> 外文期刊>Analog Integrated Circuits and Signal Processing >A study of excess loop delay in tunable continuous-time bandpass delta-sigma modulators using RC-resonators
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A study of excess loop delay in tunable continuous-time bandpass delta-sigma modulators using RC-resonators

机译：使用RC谐振器的可调谐连续时间带通delta-sigma调制器中多余环路延迟的研究

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摘要

Excess loop delay is one of the most critical non-idealities of continuous-time delta-sigma modulators as it leads to degradation of the signal-to-noise-ratio or even instability. A comprehensive study of the impact of excess loop delay on tunable continuous-time bandpass delta-sigma modulators using RC-resonators is performed in this paper, both analytically and by simulations. Moreover, a detailed analysis of the conventional compensation techniques for single-band continuous-time bandpass modulators as well as their adaptability to tunable bandpass modulators is performed. The results indicate that only tuning of the scaling coefficients is suitable to compensate for excess loop delay in high-speed tunable bandpass modulators. Based on this result, an approach to the compensation of excess loop delay is proposed which maps the poles of the noise transfer function (NFT) to almost ideal and thus stable positions. Excess loop delay equal to one clock cycle may thus be compensated while the available tuning range of the center frequency depends on the order and the out-of-band-gain of the NFT. A prototype implemented on a printed circuit board proves the feasibility of the proposed approach.
机译：过多的环路延迟是连续时间delta-sigma调制器最关键的非理想因素之一，因为它会导致信噪比下降甚至不稳定。本文通过分析和仿真，对过量环路延迟对使用RC谐振器的可调连续时间带通delta-sigma调制器的影响进行了全面研究。此外，对单带连续时间带通调制器的传统补偿技术及其对可调带通调制器的适应性进行了详细分析。结果表明，仅调整比例系数适合于补偿高速可调带通调制器中的多余环路延迟。基于此结果，提出了一种补偿多余环路延迟的方法，该方法将噪声传递函数（NFT）的极点映射到几乎理想的位置，从而达到稳定的位置。因此，可以补偿等于一个时钟周期的多余环路延迟，而中心频率的可用调谐范围取决于NFT的阶数和带外增益。在印刷电路板上实现的原型证明了该方法的可行性。

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