A 1.0–5.0GHz tunable LNA with automatic frequency calibration in 65 nm CMOS

A 1.0–5.0GHz tunable low-noise amplifier (LNA) in 65nm is presented, which employs dual feedback common gate (CG) topology to reduce the noise figure (NF) and out-of-band interference. The amplitude-detection-based automatic frequency calibration technique is proposed to overcome the effects of the process variation with little extra cost. The measured average frequency error after the calibration is less than 4.4MHz. The proposed dual feedback CG-LNA achieves the power gain of 19∼26dB. The input matching S11 is −18dB∼-5dB, and the NF is 2.4∼3.8dB. The chip consumes 10.06 mA from one 1.2V power supply, with 0.7mm
²
die area consumption.