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low distortion Quick Response Noise Filter Realized withAverage Peaks Method

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Journal of Harbin Institute of Technology(New Series) 2016年第5期23卷 39-44页

作者： Lei Liu Jianyue Ren Ko-Wen Jwo Yu Zhang Xianfeng Li University of Chinese Academy of Sciences Beijing 100049 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China

The filter proposed in this paper is expected to reduce noise whose frequency is lower than higher order harmonics of real *** is based on the distributive characteristics of noise,and uses analog circuits to select the high peak and low peak of the input signal and applies their average in order to reduce random *** it has no cutoff frequency and higher order harmonics of real signals are *** a result,it gives an instant response to changes in input signals and retains the integrity of real ***,it has only a small phase *** simulation results of slew rate,phase delay and spectral analysis under MULTISIM indicate that the quick response noise filter achieves a high slew rate of 472 V/ms and the phase shift is nearly *** having it used in a color tester design,it is also demonstrated that the proposed filter effectively reduces noise and remains signal *** the filter 's help,the relative standard deviation of the spectrograph decreases from 1% to 0.22%,indicating better stability.

关键词： low distortion quick response filter cutoff frequency

low distortion 1.31μm AlGaInAs/InP MQW DFB Laser Module for CATV Systems

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Semiconductor Photonics and Technology 1999年第2期5卷 92-95页

作者： YANG Xin-min, LIU Tao, ZHOU Ning, JIN Jin-yan, HUANG Tao, WANG Chang-hong, LI Tong-ning (Wuhan Telecommunication Devices Co.,Wuhan 430074,CHN) 武汉电信器件公司湖北武汉

A high power and low distortion 1.31 μm AlGaInAs/InP multiquantum well distributed feedback laser diode (MQW DFB LD) with RWG structure has been developed by MOCVD technique. The fiber output power of butterfly packaged module with optic isolator P f is more than 10 mW, threshold current is in the range of (13～20) mA, slope efficiency, E s>0.30 W/A and side mode suppression ratio, R S,M,S >35 dB. The composite second order, O C,S 51 dB.

关键词： CATV DFB-LD low distortion MQW CLC number:TN248.4 Document code:A

Improved low-distortion sigma-delta ADC with DWA for WLAN standards

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Journal of Semiconductors 2010年第2期31卷 82-87页

作者：李迪杨银堂朱樟明石立春吴笑峰王江安 School of Microelectronics Xidian University

An improved low distortion sigma-delta ADC（analog-to-digital converter） for wireless local area network standards is presented.A feed-forward MASH 2-2 multi-bit cascaded sigma-delta ADC is adopted; however,this work shows a much better performance than the ADCs which have been presented to date by adding a feedback factor in the second stage to improve the performance of the in-band SNDR（signal to noise and distortion ratio）,using 4-bit ADCs in both stages to minimize the quantization *** weighted averaging technology is therefore used to decrease the mismatch noise induced by the 4-bit DACs,which improves the SFDR（spurious free dynamic range） of the ADC. The modulator has been implemented by a 0.18μm CMOS process and operates at a single 1.8 V supply voltage. Experimental results show that for a 1.25 MHz @-6 dBFS input signal at 160 MHz sampling frequency,the improved ADC with all non-idealities considered achieves a peak SNDR of 80.9 dB and an SFDR of 87 dB,and the effective number of bits is 13.15 bits.

关键词： WLAN low distortion sigma-delta ADC data weighted averaging