A 45 dB Variable Gain Low Noise MMIC Amplifier
Artikel i vetenskaplig tidskrift, 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, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Herbert Zirath

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Matthew Kelly

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 54 2848-2855


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