A 1.25mW 75dB-SFDR CT filter with in-band noise reduction
A 1.25mW 75dB-SFDR CT filter with in-band noise reduction
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具有带内降噪功能的 1.25mW 75dB-SFDR CT 滤波器
DOI：
10.1109/isscc.2009.4977445
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
R. Castello
中科院分区：
文献类型：
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作者：
A. Liscidini;A. Pirola;R. Castello
在直接变频无线接收机中，基带滤波器应能够处理大的阻塞，从而满足极具挑战性的无杂散动态范围（SFDR）要求。特别是，带内增加的噪声与处理接近的带外干扰所需的线性度进行权衡[1]。由于积分噪声通常与kT/C成比例，因此一旦设置了滤波器的本底噪声，电容量以及面积和功耗的下限就大致确定了[2]。本文提出的解决方案旨在通过在输出噪声传递函数中插入带内零点来改善动态范围，从而打破这种折衷。
In a direct-conversion wireless receiver the baseband filter should be able to handle large blockers, resulting in a very challenging spurious free dynamic range (SFDR) requirement. In particular, the noise added in-band trades off with the linearity required to handle close out-of-band interferers [1]. Since the integrated noise generally is proportional to kT/C, once the noise floor for the filter is set, the amount of capacitance is roughly defined as well as a lower bound for area and power consumption [2]. The solution presented in this paper aims to break this trade off by inserting an in-band zero in the output noise transfer function to improve the dynamic range.