Design of a 2 GHz Linear-in-dB Variable-Gain Amplifier with 80-dB Gain Range | Zendy

Zhengyu Sun | Zendy; Yuepeng Yan | Zendy

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Design of a 2 GHz Linear-in-dB Variable-Gain Amplifier with 80-dB Gain Range

Author(s) -

Zhengyu Sun,

Yuepeng Yan

Publication year - 2014

Publication title -

active and passive electronic components

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.144

H-Index - 22

eISSN - 1026-7034

pISSN - 0882-7516

DOI - 10.1155/2014/434189

Subject(s) - variable gain amplifier , fully differential amplifier , video graphics array , open loop gain , gain–bandwidth product , amplifier , broadband , bandwidth (computing) , electrical engineering , distributed amplifier , automatic gain control , engineering , electronic engineering , direct coupled amplifier , operational amplifier , telecommunications , cmos

A broadband linear-in-dB variable-gain amplifier (VGA) circuit is implemented in 0.18 μm SiGe BiCMOS process. The VGA comprises two cascaded variable-gain core, in which a hybrid current-steering current gain cell is inserted in the Cherry-Hooper amplifier to maintain a broad bandwidth while covering a wide gain range. Postlayout simulation results confirm that the proposed circuit achieves a 2 GHz 3-dB bandwidth with wide linear-in-dB gain tuning range from −19 dB up to 61 dB. The amplifier offers a competitive gain bandwidth product of 2805 GHz at the maximum gain for a 110-GHz ft BiCMOS technology. The amplifier core consumes 31 mW from a 3.3 V supply and occupies active area of 280 μm by 140 μm

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