IIP2-improved Frontend Receiver using a Mismatch Compensation LNA

Abstract

In this letter, a second-order intercept point (IIP2) improved frontend receiver by compensating the differential mismatches is proposed. The mismatch compensation at the LNA makes the relative variation of the IIP2 to be less sensitive to the channel frequency and differential mismatch from the external components. The frontend receiver achieves an IIP2 of >56 dBm for all frequency bands without calibration. The IIP2 calibrator is designed with a digitally-tunable resistor, which increases the IIP2 of >68 dBm and reduces IIP2 variation of <10 dB. The proposed frontend receiver has a gain of >38 dB and NF of <3.6 dB with current consumption of 24 mA from a 1.8-V supply. The frontend receiver is fabricated using a 130-nm CMOS.