A novel IP2 calibration method for low-voltage downconversion mixers

Abstract

This paper describes a novel IP2 calibration method for double balanced current-commutating downconversion mixers. The proposed technique reduces difference between duty cycle mismatches of two switching pairs in the mixer core, being suitable especially for low-voltage monolithic downconversion mixers employing common mode feedback block in the output stage. A tunable IQ mixer prototype, fabricated in a 0.13mum RF CMOS technology and operating under low voltage supply of 1.5 V, is presented. Experimental results confirm the feasibility of the IP2 tuning technique