An Analog Controlled Variable Gain LNA with Tunable Frequency Bands

Abstract

An analog controlled Variable Gain LNA (VGLNA) with tunable operating frequency bands is reported. The analog control circuit for the continuous gain variation is proposed as a low voltage version. The fabricated LNA based on 0.18µm CMOS shows a gain range of 15 ∼ -12dB (27dB gain control), a noise figure (NF) of 2dB, and an IIP3 of -10dBm while 5mA is drawn from a 1.2V supply over the frequency range of 470∼880MHz.