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A 45 dB Variable Gain Low Noise MMIC Amplifier

M. Anowar Masud (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Herbert Zirath (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Matthew Kelly
IEEE Transactions on Microwave Theory and Techniques (0018-9480 ). Vol. 54 (2006), 6-2, p. 2848-2855 .
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: 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)

Denna post skapades 2006-10-13. Senast ändrad 2017-03-21.
CPL Pubid: 22786


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