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http://dx.doi.org/10.4313/JKEM.2008.21.4.321

Design of Variable Gain Amplifier with a Gain Slope Controller in Multi-standard System  

Choi, Moon-Ho (충북대학교 반도체공학과)
Lee, Won-Young (충북대학교 반도체공학과)
Kim, Yeong-Seuk (충북대학교 반도체공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.21, no.4, 2008 , pp. 321-328 More about this Journal
Abstract
In this paper, variable gain amplifier(VGA) with a gain slope controller has been proposed and verified by circuit simulations and measurements. The proposed VGA has a gain control, gain slope switch and variable gain range. The input source coupled pair with diode connected load is used for VGA gain stage. The gain slope controller with switch can control VGA gain slope. The proposed VGA is fabricated in $0.18{\mu}m$ CMOS process for multi -standard wireless receiver. The proposed two stage VGA consumes min. 2.0 mW to max. 2.6 mW in gain control range and gives input IP3 of -3.77 dBm and NF of 28.7 dB at 1.8 V power supply under -25 dBm, 1 MHz input. The proposed VGA has 37 dB(-16 dB $\sim$ 21 dB) variable gain range, and 8 dB gain range control per 0.3 V control voltage, and can provide variable gain, positive and negative gain slope control, and gain range control. This VGA characteristics provide design flexibility in multi-standard wireless receiver.
Keywords
Amplifier; Variable gain amplifier(VGA); AGC; Multi-standard receiver; CMOS;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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