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A 4TH ORDER FULLY INTEGRATED active rc COMPLEX filter WITH NOVEL AUTOMATIC TUNING SYSTEMS

Journal of Electronics(China) 2007年第6期24卷 854-858页

作者： Chen Dianyu Qi Feitao Sun Weiming Qin Shicai Xiong Shaozhen Institute of P-hotoelectronics Nankai University Tianjin 300071 China

This letter introduces a 4th order active rc complex filter with *** center frequency and 1MHz bandwidth. The total harmonic distortion of the filter is less than -60dB and the image rejection ratio is greater than 60dB. A novel technique is also proposed in this letter to automatically adjust the variation of the time constant. The advantages of the proposed method are its high precision and simplicity. Using 5bits control words, the tuning error is less than ±1.6%.

关键词： active rc filter Complex filter Automatic tuning system

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维普期刊数据库

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Design of an active-rc Low-Pass filter with Accurate Tuning Architecture

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Journal of Semiconductors 2008年第11期29卷 2238-2244页

作者：陈方雄林敏陈备贾海珑石寅代伐中国科学院半导体研究所北京100083 苏州中科半导体集成技术研发中心苏州215021 美国Auburn大学电机与计算机工程系

An active-rc low-pass filter of 5MHz cutoff frequency with a tuning architecture is proposed. It is implemented in 0. 18μm standard CMOS technology. The accuracy of the tuning system is improved to be within （ - 1.24%, ＋ 2.16%） in measurement. The chip area of the tuning system is only a quarter of that of the main-filter. After tuning is completed, the tuning system will be turned off automatically to save power and to avoid interference. The in-band 3rd order harmonic input intercept point （IIP3） is larger than 16. ldBm, with 50Ω as the source impedance. The input referred noise is about 36μVrms The measured group delay variation of the filter between 3 and 5MHz is only 24ns,and the filter power consump- tion is 3.6roW. This filter with the tuning system is realized easily and can be used in many wireless low-IF receiver applications, such as global position systems （GPS）, global system for mobile communications （GSM） and code division multiple access （CDMA） chips.

关键词： CMOS circuit design auto tuning active rc filter wireless system

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维普期刊数据库

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A Highly Linear filter and VGA with DC-Offset Correction for GSM/WCDMA Receivers

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Journal of Semiconductors 2007年第3期28卷 372-376页

作者：周竹瑾李志升李宁李巍任俊彦复旦大学ASIC国家重点实验室上海201203

This paper describes a complete baseband chain for both GSM and WCDMA receivers with a SMIC 0.35μm mixed signal process. The chain consists of a dual-mode,highly linear, fourth order Chebyshev active rc filter and three VGA stages. The filter is designed to meet the bandwidth specifications of the GSM and WCDMA standards and share the maximum number of components between the two modes to reduce manufacturing cost. The design is free of DC-offset and has an inter-stage high-pass filter, and operational amplifiers with adjustable GBW are used to minimize GSM-mode power consumption. The measured noise figures are 27. 3 and 42dBm in WCDMA and GSM modes,respectively, at the maximum gain. The IIP3 is 40dBm at unit gain in the WCDMA mode,and the circuit consumes 47.0mW. The IIP3 is 28dBm in the GSM mode,and the circuit consumes 31.8mW. The supply voltage is 3.3V.

关键词： active rc filter VGA Tow-Thomas DC-offset correction dual-mode

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维普期刊数据库

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