A switched-current sample-and-hold circuit with low charge injection was proposed. To obtain low noise and charge injection, the zero-voltage switching was used to remove the signal-dependent charge injection, and the...A switched-current sample-and-hold circuit with low charge injection was proposed. To obtain low noise and charge injection, the zero-voltage switching was used to remove the signal-dependent charge injection, and the signal-independent charge injection was reduced by removing the feed-through voltage from the input port of the memory transistor directly. This current sample-and-hold circuit was implemented using CMOS 180 nm 1.8 V technology. For a 0.8 MHz sinusoidal signal input, the simulated signal-to-noise and distortion ratio and total harmonic distortion were improved from 53.74 dB and -51.24 dB to 56.53 dB and -54.36 dB at the sampling rate of 20 MHz respectively, with accuracy of 9.01 bit and power consumption of 0.44 mW.展开更多
利用计算机中的扬声器信号来驱动振动线圈发出水波,可做水波干涉、衍射实验.其方法十分简单,只需要准备一个0.2K 的滑线变阻器和原实验装置中的线圈振动部分,按下面介绍的方法进行简单的操作,即可得到十分理想的实验效果。具体做法如图...利用计算机中的扬声器信号来驱动振动线圈发出水波,可做水波干涉、衍射实验.其方法十分简单,只需要准备一个0.2K 的滑线变阻器和原实验装置中的线圈振动部分,按下面介绍的方法进行简单的操作,即可得到十分理想的实验效果。具体做法如图所示:先把计算机的主机盖打开,用两条导线从扬声器的信号输入端 A 和计算机的地线展开更多
基金Supported by National Natural Science Foundation of China(No.61036004 and No.61076024)
文摘A switched-current sample-and-hold circuit with low charge injection was proposed. To obtain low noise and charge injection, the zero-voltage switching was used to remove the signal-dependent charge injection, and the signal-independent charge injection was reduced by removing the feed-through voltage from the input port of the memory transistor directly. This current sample-and-hold circuit was implemented using CMOS 180 nm 1.8 V technology. For a 0.8 MHz sinusoidal signal input, the simulated signal-to-noise and distortion ratio and total harmonic distortion were improved from 53.74 dB and -51.24 dB to 56.53 dB and -54.36 dB at the sampling rate of 20 MHz respectively, with accuracy of 9.01 bit and power consumption of 0.44 mW.
文摘利用计算机中的扬声器信号来驱动振动线圈发出水波,可做水波干涉、衍射实验.其方法十分简单,只需要准备一个0.2K 的滑线变阻器和原实验装置中的线圈振动部分,按下面介绍的方法进行简单的操作,即可得到十分理想的实验效果。具体做法如图所示:先把计算机的主机盖打开,用两条导线从扬声器的信号输入端 A 和计算机的地线
