Design of 0.35–1.5GHz 2-input 3-output SiGe switch cell with active balun

Abstract

This paper presents a 2-input and 3-output 0.35–1.5GHz switch cell with active balun. The proposed differential switch cell is composed of 8 differential series-shunt-series switches which improve the transmit efficiency of switch cell. Two wideband active baluns are used to compensate for the loss of passive switch cell which almost consumes no DC power. Fabricated by 0.18μm SiGe BiCMOS technology, the switch cell shows highest insertion gain of 9 dB and more than 40 dB isolation in working frequency band.