A 45 dB Variable Gain Low Noise MMIC Amplifier
Journal article, 2006

A variable-gain amplifier (VGA) operating at 2.5 GHz based on single-ended topology has been designed and characterized. Three such stages were cascaded and preceded by a single-stage low-noise amplifier. A source follower was used at the output in order to achieve excellent output match. The variation gain is 45 dB with a maximum gain of 47 dB. The -3-dB bandwidth is 0.8 GHz. Minimum noise figure of 0.81 dB is obtained in the highest gain mode. The highest output power, corresponding to 1-dB compression point is -7.2 dBm and the corresponding output third-order intercept point is +2 dBm. The circuit is implemented in a GaAs 0.15-/spl mu/m pseudomorphic high electron-mobility transistor technology. The combined area occupied by the multistage low-noise VGA and the single-ended VGA is 3.5 mm /spl times/ 3 mm.

Input third-order intercept point (IIP3) low-noise amplifier (LNA) noise figure (NF) output third-order intercept point (OIP3) power compression pseudomorphic high electron-mobility transistor (pHEMT) scattering parameters variable-gain amplifier (VGA)


M. Anowar Masud

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Herbert Zirath

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Matthew Kelly

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 54 6-2 2848-2855

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

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