Switched-current signal processing for video frequencies and beyond
Switched-current signal processing for video frequencies and beyond
复制标题
适用于视频及其他领域的开关电流信号处理
DOI：
10.1109/4.209998
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发表时间：
1993
影响因子：
5.4
通讯作者：
K. Moulding
中科院分区：
文献类型：
--
作者：
J. Hughes;K. Moulding
提出了具有视频性能的开关电流（SI）信号处理电路。延迟单元采用负反馈在输入节点产生“虚拟地球”，以提高传输精度。具有共模反馈的全差分结构用于减少电荷注入误差和数字信号串扰。描述了采用 1 μm 标准数字 CMOS 工艺的 IC 测试电路，包含简单的延迟线和 FIR 滤波器部分，并给出了测量的性能。通常，13.3 MHz 的 2T 延迟线采样会产生 -54 dB 的低频增益误差、-60 dB 的稳定误差、75% 调制时 -40 dB 的三次谐波失真以及 60 dB 的信噪比。存储单元器件尺寸和电流的缩放应允许 SI 在超过 100 MHz 的时钟频率下运行。 >
Switched-current (SI) signal processing circuits with video frequency performance are presented. The delay cells employ negative feedback to produce a 'virtual earth' at the input node to improve transmission accuracy. Fully differential structures with common-mode feedback are used to reduce charge injection errors and crosstalk from digital signals. An IC test circuit, in a 1 mu m standard digital CMOS process, containing simple delay lines and an FIR filter section is described, and measured performance is given. Typically, a 2T delay line sampling at 13.3 MHz gave a low-frequency gain error of -54 dB, a settling error of -60 dB, a third-harmonic distortion of -40 dB with 75% modulation, and an S/N ratio of 60 dB. Scaling of the memory cell device dimensions and currents should permit SI operation at clock frequencies beyond 100 MHz. >