4GHz continuous-time bandpass delta-sigma modulator for directly high IF A/D conversion
4GHz continuous-time bandpass delta-sigma modulator for directly high IF A/D conversion
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4GHz 连续时间带通 Delta-Sigma 调制器，用于直接高 IF A/D 转换
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Bégueret
中科院分区：
文献类型：
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作者：
A. Mariano;D. Dallet;Y. Deval;J. Bégueret
本文提出了一种用于高中频直接变频的四阶集成LC带通Δ-Σ调制器。该器件采用STMicroelectronics的0.25 μm BiCMOS SiGe：C工艺设计。该调制器能够在20 MHz带宽内直接输出1GHz中频信号。连续时间环路滤波器采用两个集成的LC谐振器与有源Q？增强电路多反馈结构用于实现高阶噪声整形，同时保持调制器的稳定性。为了降低量化噪声和提高稳定性，实现了多比特量化器。
We present in this article a fourth-order integrated LC bandpass Delta-Sigma modulator for direct conversion of high intermediate frequencies. It is designed in a 0.25 μm BiCMOS SiGe:C process from STMicroelectronics. The modulator is able to direct digitize a 1GHz IF signal in a 20MHz bandwidth. The continuous-time loop filter employs two integrated LC resonators with active Q?enhancement circuits. A multi-feedback architecture is used to achieve higher order noise-shaping, while maintaining the modulator stability. A multibit quantizer was implemented to reduce quantization noise and improve stability.