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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Switched-current signal processing for video frequencies and beyond
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Switched-current signal processing for video frequencies and beyond

机译:视频及更高频率的开关电流信号处理

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摘要

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.
机译: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处产生“虚拟地球”,以提高传输精度。具有共模反馈的全差分结构可用于减少电荷注入错误和数字信号的串扰。描述了一种采用1μm标准数字CMOS工艺的IC测试电路,该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,在13.3 MHz处进行2T延迟线采样会产生-54 dB的低频增益误差,-60 dB的建立误差,具有75%调制的-40 dB三次谐波失真以及S / N比60 dB。存储单元设备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。

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