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A widely tunable continuous-time LPF for a direct conversion DBS tuner

Journal of Semiconductors 2009年第2期30卷 85-89页

作者：陈备陈方雄马何平石寅代伐 Institute of Semiconductors Chinese Academy of Sciences Department of Electrical and Computer Engineer Auburn University

A continuous-time 7th-order Butterworth Gm-C low pass filter （LPF） with on-chip automatic tuning circuit has been implemented for a direct conversion DBS tuner in 0.35 μm SiGe BiCMOS technology. The filter＇s -3 dB cutoff frequency f0 can be tuned from 4 to 40 MHz. A novel on-chip automatic tuning scheme has been successfully realized to tune and Iock the filter＇s cutoff frequency. Measurement results show that the filter has -0.5 dB passband gain, ＋/- 5% bandwidth accuracy, 30 nV/Hz1/2 input referred noise, -3 dBVrms passband IIP3, and 27 dBVrms stopband IIP3. The I/Q LPFs with the tuning circuit draw 13 mA （with f0 = 20 MHz） from 5 V supply, and occupy 0.5 mm^2.

关键词： active filters Butterworth filters continuous-time filters direct broadcast satellite tuner Gm-C filters SiGe BiCMOS

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A switchable dual-wavelength erbium-doped fiber laser based on saturable absorber and active optical fiber ring filter

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Optoelectronics Letters 2014年第6期10卷 434-438页

作者：祝连庆陈青山赵冉冉娄小平何巍 Beijing Key Laboratory of Optoelectronic Measurement Technology Beijing Engineering Research Center of Optoelectronic Information and Instrument Beijing Information Science & Technology University School of Instrument Science and Optoelectronics Engineering Hefei University of Technology

A dual-wavelength erbium-doped fiber laser(EDFL) with outstanding stability is presented. In the fiber laser system, two nested active optical fiber ring filters are configured to improve the comb spectrum performance, a saturable absorber is employed to form a gain grating for both filtering and frequency stabilizing, two cascaded fiber Bragg gratings(FBGs) are utilized to achieve dual-wavelength output, and a variable attenuator is arranged to adjust output power. Experimental results illustrate that the peak wavelength drift is less than 3 pm, and a good linear relationship between output power and pump power is realized.

关键词： active filters Erbium Fiber lasers Fibers Saturable absorbers

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Multifunction Filter Employing Current Differencing Buffered Amplifier

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Circuits and Systems 2016年第5期7卷 543-550页

作者： Tajinder Singh Arora Udit Rana Department of Electronics and Communication Engineering Maharaja Surajmal Institute of Technology New Delhi India

This paper proposes a new filter biquad circuit, which utilizes three Current Differencing Buffered Amplifiers (CDBA), two capacitors and five resistors, and operates in the trans-resistance mode. This multi-input and single-output multifunction filter uses only grounded capacitors. All the employed resistors are either grounded or virtually grounded, which is an important parameter for its implementation as an integrated circuit. The circuit enjoys independent tunability of angular frequency and bandwidth. The 0.5 μm technology process parameters have been utilized to test and verify the performance characteristics of the circuit using PSPICE. The non-ideal analysis and sensitivity analysis, transient response, Monte-Carlo analysis and calculations of total harmonic distortion have also been shown.

关键词： active filters Current Differencing Buffered Amplifier Biquadratic Filter KHN-Biquad

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New Single Input Multiple Output Type Current Mode Biquad Filter Using OTAs

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Circuits and Systems 2016年第4期7卷 231-238页

作者： Manish Gupta Department of Electronics and Communication Engineering Greater Noida Institute of TechnologyGreater Noida India

This paper presents a new current mode (CM) single-input and multi-output (SIMO)-type biquad using two multiple output OTAs and one current follower as an active device and having two grounded capacitors. This SIMO type circuit realizes all the five filter functions as low pass, band pass, high pass, band reject and all pass filter transfer functions simultaneously. This circuit has the unity gain transfer function for all the five types of filters. The circuit enjoys electronic tunability of angular frequency and bandwidth. The 0.18 μm TSMC technology process parameters have been utilized to test and verify the performance characteristics of the circuit using PSPICE. The sensitivity analysis, transient response and calculations of total harmonic distortion have also been shown.

关键词： active filters Current Mode Operational Transconductance Amplifier Universal Filter

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Analysis on Harmonics of Distribution Network with Distributed Generators

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Journal of Energy and Power Engineering 2012年第2期6卷 220-229页

作者： Shoji Kawasaki Yasuhior Hayashi Junya Matsuki Graduate School of Electrical and Electronics Engineering University of Fukui Fukui 910-8507 Japan Graduate School of Advanced Science and Engineering Waseda University Tokyo 109-8050 Japan

In this paper, the authors analyze the influence that connection of many distributed generators （DGs） has on the harmonics of the distribution network from the viewpoints of harmonic current, harmonic voltage, and voltage total harmonic distortion （THD）, when it is assumed that the harmonic voltages or the harmonic currents in a distribution network increases by connection of many DGs through the inverters. The analysis on the influence of DGs is carried out by using a standard analytical model of distribution network with DGs based on the practical data. The authors evaluate quantitatively the influence which harmonics generated from DGs has on the harmonics of the distribution network, and analyze visually about propagation of harmonics within the distribution network. In addition, the authors also verify about the restraint effect of the harmonics in the network scale by the active filters installation.

关键词： active filters distributed generator distribution network harmonic current harmonic voltage total harmonic distortion.

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