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Automatic Gain Control: Techniques and Architectures for RF by Juan Pablo Alegre Pérez

By Juan Pablo Alegre Pérez

This publication analyzes computerized achieve regulate (AGC) loop circuits. the most goal of this ebook is to illustrate AGC ideas within the atmosphere of instant receivers, in general in instant receivers with stringent constraints in settling-time and extensive dynamic diversity, corresponding to WLAN and Bluetooth receivers. in view that feedforward AGCs current nice benefits during this context, as a substitute to standard suggestions AGCs, this e-book contains a special examine of feedforward AGCs layout –at the extent of easy AGC cells, in addition to the method point, together with their major features and performance.

  • Provides an entire evaluation of computerized achieve keep watch over loops, overlaying either suggestions and feedforward ways;
  • Describes the full layout stream of the most blocks utilized in AGC circuits (PGAs/VGAs, top detectors and keep an eye on voltage new release circuits), contemplating low-voltage low-power restrictions;
  • Includes genuine AGC architectures carried out as a normal objective electronic feedforward CMOS AGC, an absolutely analogue feedforward AGC and a mixed feedforward/feedback CMOS AGC

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Alternatively, feedforward AGC requires a highly linear peak detector; since it responds in a predefined way to the input signals. However, stability is not a concern in these AGCs. In consequence, settling-time can be made ideally zero and much faster convergence is achieved. Due to the stringent time constraints in modern communication receivers, and due to the lack of available literature, this book will focus attention on the exploration of feedforward AGCs: new devices, circuits and techniques must be studied, developed and implemented to answer the demands of wireless technology, which is becoming ever faster, smaller and more complex.

114 –117, 2005. 12. W. -I. -K. Wei; “CMOS exponential-control variable gain amplifiers”; Circuits, Devices and Systems, IEE Proceedings; Vol. 151, Issue 2, pp. 83–86, Apr. 2004. 13. -C. -F. -C. Huang; “A Low-Power CMOS Linear-in-Decibel Variable Gain Amplifier With Programmable Bandwidth and Stable Group Delay”; Circuits and Systems II: Express Briefs, IEEE Transactions on; Vol. 53, Issue 12, pp. 1436–1440, Dec. 2006. 14. B. Gilbert; “Limiting-Logarithmic Amplifiers”; Electronics Laboratories Advanced Engineering Course on RF IC Design for Wireless Communication Systems; Lausanne, Switzerland, Jul.

C. -F. -C. Huang; “A Low-Power CMOS Linear-in-Decibel Variable Gain Amplifier With Programmable Bandwidth and Stable Group Delay”; Circuits and Systems II: Express Briefs, IEEE Transactions on; Vol. 53, Issue 12, pp. 1436–1440, Dec. 2006. 14. B. Gilbert; “Limiting-Logarithmic Amplifiers”; Electronics Laboratories Advanced Engineering Course on RF IC Design for Wireless Communication Systems; Lausanne, Switzerland, Jul. 1995. 15. Hung Yan Cheung, King Sau Cheung, J. Lau; “A low power monolithic AGC with automatic DC offset cancellation for direct conversion hybrid CDMA transceiver used in telemetering”; Circuits and Systems, 2001.

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