Broadband differential 1.5–5 GHz LO buffer amplifier based on SiGe BiCMOS technology

Abstract

This paper presents the design of the monolithic pseudo-differential buffer amplifier based on 0.25 um SiGe BiCMOS technology for mixer local oscillator (LO) input. LO buffer amplifier is implemented using pseudo-differential cascode circuit with voltage parallel feedback circuit. Buffer amplifier designed for 1.5–5 GHz frequency band and has power gain Gt = 15 dB with 0.5 dB ripple, 1-dB compression point P1dB is more than 15 dBm, chip size is 1.2×2.1 mm².