Microelectronics

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

By Juan Pablo Alegre Pérez

This e-book analyzes automated achieve keep watch over (AGC) loop circuits. the most target of this e-book is to illustrate AGC strategies within the surroundings of instant receivers, quite often in instant receivers with stringent constraints in settling-time and extensive dynamic diversity, corresponding to WLAN and Bluetooth receivers. considering feedforward AGCs current nice benefits during this context, in its place to standard suggestions AGCs, this e-book incorporates a designated examine of feedforward AGCs layout –at the extent of simple AGC cells, in addition to the approach point, together with their major features and performance.

  • Provides a whole assessment of automated achieve keep an eye on loops, masking either suggestions and feedforward techniques;
  • Describes the total layout circulation of the most blocks utilized in AGC circuits (PGAs/VGAs, height detectors and keep watch over voltage iteration circuits), contemplating low-voltage low-power restrictions;
  • Includes genuine AGC architectures carried out as a basic function electronic feedforward CMOS AGC, a completely analogue feedforward AGC and a mixed feedforward/feedback CMOS AGC

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Additional info for Automatic Gain Control: Techniques and Architectures for RF Receivers

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65€mW. 1€mW. 19), gain variation is obtained.

These values have been chosen so that the control voltage input range can be maximized up to ±â•›400€mV, while the maximum differential input signal can swing up to 400€mVp-p. Measurements were taken using a buffer after the VGA to reduce external parasitic capacitance influence and CC was chosen external to save chip area. Post-layout simulations provide a maximum gain range of 36€dB (from −18 to 18€dB) for an almost constant bandwidth of 200€MHz, while measurements verify a similar performance offering a 190€MHz bandwidth and a minimum gain range from 0 to 18€dB.

2139–2141, 17-20 May 1993. ╇ 8. J. Smith; “Modern Communication Circuits”; McGraw-Hill, 1986. ╇ 9. M. Khoury; “On the design of constant settling time AGC circuits”; Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on; Vol. 45, Issue 3, pp. 283– 294, Mar. 1998. 10. K. D. C. H. Cho; “Wideband high dynamic range CMOS variable gain amplifier for low voltage and low power wireless applications”; Electronics Letters; Vol. 39, Issue 10, pp. 759–760, May 2003. 11. Quoc-Hoang Duong, Le-Quan, and Sang-Gug Lee; “An All CMOS 84dB-Linear Low-Power Variable Gain Amplifier”; Digest of Technical Papers Symposium on VLSI Circuits; pp.

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