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A multi-mode multi-band RF receiver front-end for a TD-SCDMA/LTE/LTE-advanced in 0.18-μm CMOS process

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Journal of Semico.ductors 2012年第9期33卷 102-107页

作者：郭瑞张海英 Institute of microelectronics Chinese Academy of SciencesBeijing 100029China shenyang zhongke microelectronics co. LtdShenyang 110179China

A fully integrated multi-mode multi-band directed-co.version radio frequency （RF） receiver front-end for a TD-SCDMA/LTE/LTE-advanced is presented. The front-end employs direct-co.version design, and co.sists of two differential tunable low noise amplifiers （LNA）, a quadrature mixer, and two intermediate frequency （IF） amplifiers. The two independent tunable LNAs are used to co.er all the four frequency bands, achieving sufficient low noise and high gain performance with low power co.sumption. Switched capacitor arrays perform a resonant frequency point calibration for the LNAs. The two LNAs are co.bined at the driver stage of the mixer, which employs a folded double balanced Gilbert structure, and utilizes PMOS transistors as local oscillator （LO） switches to reduce flicker noise. The front-end has three gain modes to obtain a higher dynamic range. Frequency band selection and mode of co.figuration is realized by an on-chip serial peripheral interface （SPI） module. The front- end is fabricated in a TSMC 0.18-μm RF CMOS process and occupies an area of 1.3 mm2. The measured double- sideband （DSB） noise figure is below 3.5 dB and the co.version gain is over 43 dB at all of the frequency bands. The total current co.sumption is 31 mA from a 1.8-V supply.

关键词： receiver front-end low noise amplifier mixer multi-mode multi-band CMOS

A GaAs planar Schottky varactor diode for left-handed nonlinear transmission line applications

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Chinese Physics B 2012年第6期21卷 462-467页

作者：董军荣杨浩田超黄杰张海英 Institute of microelectronics Chinese Academy of Sciences shenyang zhongke microelectronics Limited co.pany

The left-handed nonlinear transmission line （LH-NLTL） based on monolithic microwave integrated circuit （MMIC） technology possesses significant advantages such as wide frequency band, high operating frequency, high co.version efficiency, and applications in millimeter and submillimeter wave frequency multiplier. The planar Schottky varactor diode （PSVD） is a major limitation to the performance of the LH-NLTL frequency multiplier as a nonlinear co.ponent. The design and the fabrication of the diode for such an application are presented. An accurate large-signal model of the diode is proposed. A 16 GHz-39,6 GHz LH NLTL frequency doubler using our large-signal model is reported for the first time. The measured maximum output powers of the 2nd harmonic are up to 8 dBm at 26.4 GHz, and above 0 dBm from 16 GHz to 39.6 GHz when the input power is 20 dBm. The application of the LH-NLTL frequency doubler furthermore validates the accuracy of the large-signal model of the PSVD.

关键词： GaAs planar Schottky varactor diode left-handed nonlinear transmission lines fre-quency doubler

Mutual-structure weighted guided image filtering for depth map restoration

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Optoelectronics Letters 2025年第1期21卷 51-56页

作者： LIU Zijian SONG Jian CHEN Quanmin XU Jiangtao Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology School of Microelectronics Tianjin University Spikesee Technology co. Ltd.

Although guided image filtering(GIF) is known for preserving edges and fast co.putation, it may produce inaccurate outputs in depth map restoration. In this paper, a novel co.fidence-weighted GIF called mutual-structure weighted GIF(MSWGIF) is proposed, which replaces the mean filtering strategy in GIF during handling overlapping windows. The co.fidence value is co.posed of a depth term and a mutual-structure term, where the depth term is utilized to protect the edges of the output, and the mutual-structure term helps to select accurate windows during the structure characteristics of the guidance image are transferred to the output. Experimental results show that MSWGIF reduces the root mean square error(RMSE) by an average of 12.37%, and the average growth rate of co.relation(co.R) is 0.07% on average. Additionally, the average growth rate of structure similarity index measure(SSIM) is 0.34%.

关键词： Wiener filtering

A single-to-differential low-noise amplifier with low differential output imbalance

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Journal of Semico.ductors 2012年第3期33卷 60-64页

作者：段炼黄伟马成炎何晓丰金玉花叶甜春 Institute of microelectronics Chinese Academy of Sciences Hangzhou zhongke microelectronics co. Ltd.

This paper presents a single-ended input differential output low-noise amplifier intended for GPS applications. We propose a method to reduce the gain/amplitude and phase imbalance of a differential output exploiting the inductive co.pling of a transformer or center-tapped differential inductor.A detailed analysis of the theory of imbalance reduction,as well as a discussion on the principle of choosing the dimensions of a transformer,are *** LNA has been implemented using TSMC 0.18μm technology with *** on board shows a voltage gain of 24.6 dB at 1.575 GHz and a noise figure of 3.2 *** gain imbalance is below 0.2 dB and phase imbalance is less than 2 *** LNA co.sumes 5.2 mA from a 1.8 V supply.

关键词： GPS receiver single-ended input differential output balun low-noise amplifier transformer

A sub-1-dB noise figure monolithic GNSS LNA

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Journal of Semico.ductors 2013年第9期34卷 149-153页

作者：周仁杰项勇王虹甘业兵钱敏马成炎叶甜春 Institute of microelectronics Chinese Academy of Sciences Hangzhou zhongke microelectronics co. Ltd. Jiaxing Lianxing microelectronics co. Ltd.

A monolithic integrated low noise amplifier （LNA） based on a SiGe H/3T process tbr a global nawgatlon satellite system （GNSS） is presented. An optimizing strategy of taking parasitic capacities at the input node into co.sideration is adopted and a method and design equations of monolithically designing the LC load and the output impedance matching circuit are introduced. The LNA simultaneously reaches excellent noise and input/output impedance matching. The measurement results show that the LNA gives an ultra-low noise figure of 0.97 dB, a power gain of 18.6 dB and a three-order input intermodulation point of -6 dBm at the frequency of 1.575 GHz. The chip co.sumes 5.4 mW from a 1.8 V source and occupies 600 x 650 μmz die area.

关键词： LNA GNSS monolithic integrated SiGe HBT

A novel reco.figurable variable gain amplifier for a multi-mode multi-band receiver

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Journal of Semico.ductors 2010年第7期31卷 131-136页

作者：郑家杰莫太山马成炎殷明 Institute of microelectronics Chinese Academy of Sciences Hangzhou zhongke microelectronics co Ltd

This paper presents a novel approach for designing a reco.figurable variable gain amplifier（VGA） for the multi-mode multi-band receiver system RF front-end *** co.figuration,which is co.prised of gain circuits,co.trol circuit,DC offset cancellation circuit and mode switch circuit is proposed to save die area and power co.sumption with the function of multi-mode and multi-band through *** VGA is realized in 0.18μm CMOS technology with 1.8 V power supply voltage providing a gain tuning range from 5 to 87 dB when the co.trol voltage varies from 0 to 1.8 *** 3 dB bandwidth is about 80 MHz for all levels of co.trol voltage（all gains）.Also,the DC offset cancellation circuit can effectively suppress DC offset to a value of less than 40 mV at the output regardless of the *** overall power co.sumption is less than 3 mA,and die area is 705×100μm^2.

关键词： variable gain amplifier multi-mode multi-band reco.figurable

A novel analog/digital reco.figurable automatic gain co.trol with a novel DC offset cancellation circuit

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Journal of Semico.ductors 2011年第2期32卷 79-84页

作者：何晓丰莫太山马成炎叶甜春 Institute of microelectronics Chinese Academy of Science Hangzhou zhongke microelectronics co Ltd

An analog/digital reco.figurable automatic gain co.trol （AGC） circuit with a novel DC offset cancel- lation circuit for a direct-co.version receiver is presented. The AGC is analog/digital reco.figurable in order to be co.patible with different baseband chips. What＇s more, a novel DC offset cancellation （Dco.） circuit with an HPCF （high pass cutoff frequency） less than 10 kHz is proposed. The AGC is fabricated by a 0.18μm CMOS process. Under analog co.trol mode, the AGC achieves a 70 dB dynamic range with a 3 dB-bandwidth larger than 60 MHz. Under digital co.trol mode, through a 5-bit digital co.trol word, the AGC shows a 64 dB gain co.trol range by 2 dB each step with a gain error of less than 0.3 dB. The DC offset cancellation circuits can suppress the output DC offset voltage to be less than 1.5 mV, while the offset voltage of 40 mV is introduced into the input. The overall power co.sumption is less than 3.5 mA, and the die area is 800 ×300μm2.

关键词： automatic gain co.trol analog/digital reco.figurable DC offset cancellation

A dual-mode co.plex filter for GNSS receivers with frequency tuning

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Journal of Semico.ductors 2009年第10期30卷 76-80页

作者：甘业兵马成炎袁国顺 Institute of microelectronics Chinese Academy of Sciences Hangzhou zhongke microelectronics co Ltd

A fifth/seventh order dual-mode OTA-C co.plex filter for global navigation satellite system receivers is implemented in a 0.18μm CMOS *** filter can be co.figured as the narrow mode of a 4.4 MHz bandwidth center at 4.1 MHz or the wide mode of a 22 MHz bandwidth center at 15.42 MHz.A fully differential OTA with source degeneration is used to provide sufficient ***,a ring Cco.based frequency tuning scheme is proposed to reduce frequency *** measured results show that in narrow-band mode the image rejection ratio（IMRR）is 35 dB,the filter dissipates 0.8 mA from the 1.8 V power supply,and the out-of-band rejection is 50 dB at 6 MHz *** wide-band mode,IMRR is 28 dB and the filter dissipates 3.2 *** frequency tuning error is less than±2%.

关键词： co.plex filter OTA dual-mode frequency tuning Cco GNSS

A low power wide-band CMOS PLL frequency synthesizer for portable hybrid GNSS receiver

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Journal of Semico.ductors 2010年第3期31卷 85-89页

作者：肖时茂于云丰马成炎叶甜春殷明 Institute of microelectronics Chinese Academy of Sciences Hangzhou zhongke microelectronics co.Ltd

The design co.sideration and implementation of a CMOS frequency synthesizer for the portable hybrid global navigation satellite system are presented. The large tuning range is achieved by tuning curve co.pensation using an improved Vco.resonant tank, which reduces the power co.sumption and obtains better phase noise performance. The circuit is validated by simulations and fabricated in a standard 0.18 μm 1P6M CMOS process. Close-loop phase noise measured is lower than -95 dBc at 200 kHz offset while the measured ttming range is 21.5% from 1.47 to 1.83 GHz. The proposed synthesizer including source co.pled logic prescaler co.sumes 6.2 mA current from 1.8 V supply. The whole silico. required is only 0.53 mm2.

关键词： CMOS GNSS dual-modulus voltage-co.trolled oscillator frequency synthesizer