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SiGe Analog AGC Circuit for an 802.11a WLAN Direct Conversion Receiver

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5 Author(s)
Alegre, J.P. ; Electron. Design Group (I3A), Univ. of Zaragoza, Zaragoza ; Celma, S. ; Calvo, B. ; Fiebig, N.
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This brief presents a baseband automatic gain control (AGC) circuit for an IEEE 802.11a wireless local area network (WLAN) direct conversion receiver. The whole receiver is to be fully integrated in a low-cost 0.25- mum 75-GHz SiGe bipolar complementary metal-oxide-semiconductor (BiCMOS) process; thus, the AGC has been implemented in this technology by employing newly designed cells, such as a linear variable gain amplifier (VGA) and a fast-settling peak detector. Due to the stringent settling-time constraints of this system, a feedforward gain control architecture is proposed to achieve fast convergence. The proposed AGC is composed of two coarse-gain stages and a fine-gain stage, with a feedforward control loop for each stage. It converges with a gain error of below plusmn1 dB in less than 3.2 mus, whereas the power and area consumption are 13.75 mW and 0.225 mm2 , respectively.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:56 ,  Issue: 2 )