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A Fully Digital Automatic Gain Control System with Wide Dynamic Range Power Detectors for DVB-S2 Application  

Pu, Young-Gun (Department of Electric Engineering, Konkuk University)
Park, Joon-Sung (Department of Electric Engineering, Konkuk University)
Hur, Jeong (Department of Electric Engineering, Konkuk University)
Lee, Kang-Yoon (Department of Electric Engineering, Konkuk University)
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Abstract
This paper presents a fully digital gain control system with a new high bandwidth and wide dynamic range power detector for DVB-S2 application. Because the peak-to-average power ratio (PAPR) of DVB-S2 system is so high and the settling time requirement is so stringent, the conventional closed-loop analog gain control scheme cannot be used. The digital gain control is necessary for the robust gain control and the direct digital interface with the baseband modem. Also, it has several advantages over the analog gain control in terms of the settling time and insensitivity to the process, voltage and temperature variation. In order to have a wide gain range with fine step resolution, a new AGC system is proposed. The system is composed of high-bandwidth digital VGAs, wide dynamic range power detectors with RMS detector, low power SAR type ADC, and a digital gain controller. To reduce the power consumption and chip area, only one SAR type ADC is used, and its input is time-interleaved based on four power detectors. Simulation and measurement results show that the new AGC system converges with gain error less than 0.25 dB to the desired level within $10{\mu}s$. It is implemented in a $0.18{\mu}m$ CMOS process. The measurement results of the proposed IF AGC system exhibit 80-dB gain range with 0.25-dB resolution, 8 nV/$\sqrt{Hz}$ input referred noise, and 5-dBm $IIP_3$ at 60-mW power consumption. The power detector shows the 35dB dynamic range for 100 MHz input.
Keywords
DVB-S2; AGC; VGA; wide dynamic range; power detector; RMS;
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1 고동현, 박도진, 정성규, 부영건, 이강윤, "PHS용 Automatic Tuning 방법을 이용한 Complex Filter", 전자공학회논문지, 제 44권 SD편 제 10호, pp, 17-22, October, 2007
2 Mark Dawkins, et al., "A Single-Chip Tuner for DVB-T" , IEEE Journal of Solid-State Circuits, vol.38, no.8, August 2003   DOI   ScienceOn
3 J. M. Khoury, "On the design of constant settling time AGe circuits," IEEE Trans. Circuits Syst. II, Analog Digit. Signal Process., vol.45, no.3, pp.283-294, Mar. 1998   DOI   ScienceOn
4 Jianhong Xiao, et al., "A High Dynamic Range CMOS Variable Gain Amplifier for Mobile DTV Tuner,", IEEE Journal of Solid-State Circuits, vol.42, no.2, pp.292-301, February 2007   DOI   ScienceOn
5 이강윤, 구현철, 허정, "새로운 자동 튜닝 기능을 가지고 있는 CMOS 다중 모드 기저대역필터의 설계", 전자공학회논문지, 제 43권 SD편 제 2호, pp.34-41, February 2006
6 Draft ETSI EN 302 307 VU.1, 2004-00
7 Okjune Jeon, et al., "Analog AGe Circuitry for a CMOS WLAN Receiver," IEEE Journal of Solid-State Circuits, vol.41, no.10, pp.2291-2300, October 2006   DOI   ScienceOn
8 Chi-Fang Li, Cheng, R.j.-H, "A two-stage digital AGe scheme with diversity selection for frame-based OFDM systems" in IEEE ISCAS, 2006, pp.4
9 Kang-Yoon Lee, et al., "Full-CMOS 2-GHz WCDMA Direct Conversion Transmitter and Receiver", IEEE Journal of Solid-State Circuits, Vol.38, No.1, pp.43-53, Jan 2003   DOI   ScienceOn
10 Chung-Wei Lin, et al., "A low distortion and fast settling automatic gain control amplifier in CMOS technology" in IEEE ISCAS, 2004, pp.I-541-4