A Zero-Pole Reposition Based, 0.95-mW, 68-dB, Linear-in-dB, Constant-Bandwidth Variable Gain Amplifier

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• 作者：Hassan Faraji?Baghtash (1)
  Ahmad Ayatollahi (1)
  
• 关键词：Zero ; pole repositioning ; Constant bandwidth ; High speed ; Linear ; in ; dB ; Low power ; Variable gain amplifier
• 刊名：Circuits, Systems, and Signal Processing
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：33
• 期：5
• 页码：1353-1368
• 全文大小：
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• 作者单位：Hassan Faraji?Baghtash (1)
  Ahmad Ayatollahi (1)
  
  1. Department of Electrical and Electronics Engineering, Iran University of Science and Technology (IUST), Narmak, 1684613114, Tehran, Iran
  
• ISSN：1531-5878

文摘

A variable-gain amplifier with very low power consumption and wide tuning range is presented. 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 N-well CMOS fabrication process. Owing to the novel zero-pole repositioning technique, the proposed circuit demonstrates very high frequency bandwidth of 79?MHz while drawing only 0.52?mA from 1.8?V power supply. The interesting results such as a very small core area of about 0.0025?mm2 as well as a wide linear-in-dB and constant-bandwidth tuning range of 68.2?dB along with a very low power consumption of 0.95?mW are achieved utilizing standard CMOS technology. The stability of the proposed VGA is verified through transient sinusoidal response analysis. Full process, voltage and temperature (PVT) variation analysis of the circuit is also investigated through Monte Carlo and corner case analysis in order to approve the robustness of the structure. Monte Carlo simulations show standard deviation values of 4.6?dB and 78.3?MHz in gain and gain-bandwidth product, respectively. These results show that our zero-pole repositioning method would lend itself well for use in low-power and high-frequency applications, especially in high-speed automatic gain control amplifiers.