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A 4th-order reconfigurable analog baseband filter for software-defined radio applications

Journal of Semiconductors 2011年第4期32卷 137-144页

作者：王伟威常学贵王肖韩科锋谈熙闫娜闵昊 State Key Laboratory of ASIC & System Fudan University

This paper presents a 4th-order reconfigurable analog baseband filter for software-defined *** design exploits an active-RC low pass filter（LPF） structure with digital assistant,which is flexible for tunability of filter characteristics,such as cut-off frequency,selectivity,type,noise,gain and power.A novel reconfigurable operational amplifier is proposed to realize the optimization of noise and scalability of power *** chip was fabricated in an SMIC 0.13μm CMOS *** main filter and frequency calibration circuit occupy 1.8×0.8 mm;and 0.48×0.25 mm;areas,*** measurement results indicate that the filter provides Butterworth and Chebyshev responses with a wide frequency tuning range from 280 kHz to 15 MHz and a gain range from 0 to 18 *** IIP3 of 29 dBm is achieved under a 1.2 V power *** input inferred noise density varies from 41 to 133 nV/（Hz）;according to a given standard,and the power consumptions are 5.46 mW for low band（from 280 kHz to 3 MHz） and 8.74 mW for high band（from 3 to 15 MHz） mode.

关键词： reconfigurable software-defined radio baseband filter digital assistant high linearity

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A low power wide tuning range baseband filter for multistandard transceivers

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Journal of Semiconductors 2015年第4期36卷 131-142页

作者：耿志卿吴南健 School of Information and Electrical Engineering Hebei University of Engineering State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences

This paper presents the design and implementation of a low power wide tuning range baseband filter with an accurate on-chip tuning circuit for reconfigurable multistandard wireless transceivers. The realized low pass filter （LPF） is a six-order Butterworth type by cascading three stage active-Gm-RC biquadratic cells. A mod- ified linearization technique is used to improve the filter linearity performance at low power consumption. A new process-independent transconductor matching circuit and a new frequency tuning circuit with frequency compen- sation are proposed to achieve a high precision filter frequency response. The proposed LPF is realized in a 130 nm standard CMOS technology. The measured results show that the LPF exhibits a high bandwidth programmability from 0.1 to 25 MHz with a tuning frequency error less than 2.68% over the wide tuning range. The power consump- tion is scalable, ranging from 0.52 to 5.25 mA, from a 1.2 V power supply while achieving a 26.3 dBm in-band IIP3.

关键词： low power baseband filter frequency tuning

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