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JSSC 2015第3期Other160nm

Compact Cascadable g m-C All-Pass True Time Delay Cell With Reduced Delay V aria

提出一种紧凑可级联的gm-C全通真延时单元，适用于1-2.5 GHz频段，具有低延迟变化和高线性度。
160 nm CMOS, 550 ps最大延迟, 13 ps步进, 1-2.5 GHz频段
gm-C全通滤波器真延时单元CMOS相位线性度时间阵列接收机
▸创新点1：紧凑可级联的gm-C全通滤波器设计，采用160 nm CMOS工艺，实现了550 ps的最大延迟，延迟面积比提升至少50倍，显著减小了芯片尺寸。
▸创新点2：5倍频率范围扩展，通过优化gm-C滤波器设计，将工作频率范围扩展至1–2.5 GHz，同时保持增益变化在1 dB以内，提升了宽带性能。
▸创新点3：延迟变化小于10 ps，通过改进电路技术，实现了RMS延迟变化误差小于10 ps，确保了在宽频带内的延迟稳定性。
▸创新点4：提出设计方程和非理想性分析，推导了传输函数及多种非理想性的设计方程，为滤波器设计提供了理论支持。
Abstract
At low-GHz frequencies, analog time-delay cells re- alized by LC delay lines or transmission lines are unpractical in CMOS, due to their large size. As an alternative, delays can be ap- proximated by all-pass filters exploiting transconductors and ca- pacitors (g m-C filters). This paper presents an easily cascadable compact gm-C all-pass filter cell for 1–2.5 GHz. Compared to pre- vious gm-RC and g m-C filter cells, it achieves at least 5x larger fre- quency range for the same relative delay variat