A dual-loop automatic gain control for infrared communication system
Resource
ASIC, 2002. Proceedings. 2002 IEEE Asia-Pacific Conference on
Journal
ASIC, 2002. Proceedings. 2002 IEEE Asia-Pacific Conference on
Pages
-
Date Issued
2002-08
Date
2002-08
Author(s)
Lin, Chien-Chih
Shieu, Muh-Tain
Wang, Chorng-Kuang
DOI
N/A
Abstract
This paper presents a dual-loop automatic gain control (AGC) employed in a 10 Mbps infrared communication system. The AGC is composed of an exponential-type variable-gain amplifier, a shaping filter, a gain/buffer stage, a noncoherent envelope detector, and a pair of integrators that provide dual loop bandwidths. The switch and two integrators are realized by a proposed switched integrator technique. The fast acquisition is accomplished by a 500 kHz loop bandwidth at the initial acquisition state and followed by a 50 kHz loop bandwidth at the steady state. The AGC is implemented in 0.6 /spl mu/m SPTM CMOS technology. According to the post-layout simulation, it achieves an acquisition time of 5 /spl mu/s and provides a constant output of 1V/sub pp/ at a 50 /spl Omega/ load for 20 dB input signal amplitude range. The dual-loop AGC consumes 88 mW power from a single 3.3 V supply and occupies 1.8/spl times/1.8 mm/sup 2/ area.
SDGs
Type
journal article
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