Abstract

This paper describes a highly linear lowvoltage 2 GHz AlGaAs HBT fully balanced downconversion mixer. The circuit is designed to operate with a supply voltage from 4.2V down to 3.2V. Both input ports ( LO/RF ) are single ended and well matched to 50 . Our results show a conversion gain of -7 dB and a third-order intercept point of 7 dBm realized at 3.6 V. The mixer utilizes 3 x 30 m2 single-finger HBTs fabricated in an Infineon AlGaAs/GaAs bipolar process. The size of the chip is 1 x 1 mm2.