A wideband BiCMOS variable gain amplifier with novel continuous dB-linear gain control and temperature compensation

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• 作者：Zheng Hao Lu ; Xiao Peng Yu ; Kiat-Seng Yeo
• 关键词：Variable gain amplifier ; dB ; Linear ; Wideband ; VGA ; BiCMOS
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：90
• 期：2
• 页码：499-506
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems; Electrical Engineering; Signal,Image and Speech Processing;
• 出版者：Springer US
• ISSN：1573-1979
• 卷排序：90

文摘

In this paper, we present an accurate analog decibel linear control circuit for variable gain amplifiers (VGAs). The proposed circuit features simple and effective dB-linear control for current steering VGAs. A novel temperature compensation circuit is also proposed for this VGA. Based on the proposed circuit design techniques, a wideband single stage VGA with accurate analog dB-linear gain control and temperature compensation is realized in Tower Jazz 0.18 μm SiGe BiCMOS technology. The measurement result shows the proposed VGA S₂₁ gain is tunable from −50 to +20 dB with a −3 dB bandwidth of about 4.6 GHz. The measured IIP3 is from −29 to −8 dBm for maximum and minimum gain respectively and dissipates about 11 mA current from a single 1.8 V supply. The measured noise figure at maximum gain is about 8.5 dB when matched to 50 Ω and the VGA performance is insensitive to temperature variation when measured from −40 to +80 °C.