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Periodically Time-V arying Noise Cancellation for Filtering-by-Aliasing Receiver
提出一种周期性时变噪声消除技术,用于滤波混叠接收器,提升噪声性能。
28nm CMOS, 0.9V, 61mW, 500MHz LO
噪声消除滤波混叠接收器时变跨导CMOS射频前端
▸创新点1:周期性时变噪声消除技术(方法创新)。通过引入周期性时变电阻噪声消除机制,在滤波混叠接收器中实现3 dB的噪声系数改进,同时保持67 dB的阻带抑制和仅4倍射频带宽的过渡带性能。
▸创新点2:时变跨导单元噪声感知(电路创新)。采用可编程Gm单元动态检测PTV电阻噪声,在不影响滤波锐度的前提下实现噪声耦合路径的精确抵消,实测带内噪声系数最低达3.2 dB。
▸创新点3:滤波混叠接收器系统架构优化(系统创新)。结合前置N路径滤波器提升线性度,实现+18 dBm带外IIP3和+9 dBm阻塞1dB压缩点,整体芯片在0.9V供电下仅消耗61mW@500MHz LO。
▸创新点4:混合信号集成设计(工艺创新)。在28nm CMOS工艺中实现数字控制电路与模拟噪声消除模块的协同设计,通过时间交织技术解决PVT变化对PTV稳定性的影响。
Abstract
This article presents a periodically time-varying
(PTV) noise cancellation technique for filtering-by-aliasing (FA)
receivers. The key to the proposed technique is the use of a time-
varying transconductance ( G
m) cell to sense the noise generated
by the PTV resistor in an FA receiver while maintaining the
sharp filtering offered by FA. A prototype IC fabricated in a
28-nm CMOS process improves the noise figure (NF) by about
3 dB while achieving over 67-dB stopband rejection with a
transition band