A wide-band low noise amplifier using cross-coupled technique with linear in dB gain-control

Chang, Chia-Hung; Lee, Ching-Feng; Tsou, Yu-Lin

doi:10.1109/icuwb.2009.5288837

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2014

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“…VGA as a key component in the automatic gain control (AGC) loop provides constant signal strength to the baseband processor to maximize the dynamic range of the receiver system and compensates gain variations caused by process, voltage, and temperature (PVT) variations. Research in SiGe and CMOS circuits in the broadband VGA is an active topic in optical, wireline, and millimeterwave receivers [2][3][4][5][6]. Among various broadband techniques, Cherry-Hooper amplifier [7] has had numerous applications in AGC and limiting amplifiers.…”

Section: Introductionmentioning

confidence: 99%

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

Sun

Yan

2014

Active and Passive Electronic Components

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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 ftBiCMOS 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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