A 0.74 mW, linear-in-dB, constant bandwidth, variable gain amplifier based on zero-pole repositioning technique

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• 作者：Hassan Faraji Baghtash
• 关键词：Constant bandwidth ; Zero ; pole repositioning ; Linear ; in ; dB ; Low power ; Variable gain amplifier
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：84
• 期：2
• 页码：303-313
• 全文大小：1,741 KB
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  4.Yang, S.-H., & Wang, C.-C. (2012). A low power 48-dB/stage linear-in-dB variable gain amplifier for direct-conversion receivers. Microelectronics Journal, 43(4), 274-79. doi:10.-016/?j.?mejo.-012.-1.-05 .View Article
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• 作者单位：Hassan Faraji Baghtash (1)
  
  1. Department of Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, 1477893855, Tehran, Iran
  
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems
  Electronic and Computer Engineering
  Signal,Image and Speech Processing
  
• 出版者：Springer Netherlands
• ISSN：1573-1979

文摘

A zero-pole repositioning based variable gain amplifier is presented in this paper. The operational principle of this unique structure is discussed, its most important formulas are derived and its outstanding performance is verified by simulation in TSMC 0.18?μm standard CMOS technology. Owing to the cutting-edge structure, the proposed circuit demonstrates a very low power consumption of 0.74 mW and a wide tuning range of 83?dB. The proposed structure benefits from linear-in-dB and constant bandwidth specifications. The linear-in-dB gain range of structure is about 70?dB. The structure draws about 413 μA from 1.8?V power supply and regarding this low power consumption, it shows a lower and upper 3-dB cutoff frequencies of 8?Hz and 8.1?MHz, respectively. Process and temperature variation analysis of the circuit is also investigated through Monte Carlo and corner case analysis in order to verify the well-robustness of the structure. The transient sinusoidal response analysis is also done to verify the proposed VGA’s stability.