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Design and implementation of a 1.5‐ to 17‐GHz SiGe UWB LNA utilizing multiple‐feedback loops and inductive peaking technique
Author(s) -
Yen ShuHui,
Lin YoSheng,
Chen ChiChen
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22284
Subject(s) - return loss , electrical engineering , noise figure , inductor , amplifier , low noise amplifier , wideband , bandwidth (computing) , inductance , bicmos , microwave , engineering , electronic engineering , chip , voltage , physics , cmos , telecommunications , transistor , antenna (radio)
Abstract In this paper, we demonstrate a 1.5‐ to 17‐GHz ultra‐wideband (UWB) low‐noise amplifier (LNA) with small‐inductance input inductor and multiple‐feedback loops implemented in a 0.35 μm SiGe BiCMOS technology. A method named inductive peaking, which adds an inductor in series with the base‐terminal of the second‐stage amplifier to enhance the frequency of the dominant pole, was adopted to improve gain and bandwidth of the LNA. The measurement results show that very flat gain (S 21 ) of 8 ± 0.5 dB was achieved for frequencies between 2 and 15 GHz. In addition, reverse isolation (S 12 ) lower than −27 dB, input return loss (S 11 ) and output return loss (S 22 lower than −9 dB, and noise figure lower than 5.5 dB was achieved in the 3.1–10.6 GHz UWB band. The chip area was 775 × 710 μm 2 , excluding the test pads. This LNA drains 7 mA current at supply voltage of 3 V, i.e. it only consumes 21 mW power. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 876–879, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22284