A Novel Low Power UWB Cascode SiGe BiCMOS LNA with Current Reuse and Zero-Pole Cancellation

摘要

A low power cascode SiGe BiCMOS low noise amplifier (LNA) with current reuseand zero-pole cancellation is presented for ultra-wideband (UWB) application.The LNA is composed of cascode input stage and common emitter (CE) output stagewith dual loop feedbacks. The novel cascode-CE current reuse topology replacesthe traditional two stages topology so as to obtain low power consumption. Theemitter degenerative inductor in input stage is adopted to achieve good inputimpedance matching and noise performance. The two poles are introduced by theemitter inductor, which will degrade the gain performance, are cancelled by thedual loop feedbacks of the resistance-inductor (RL) shunt-shunt feedback andresistance-capacitor (RC) series-series feedback in the output stage.Meanwhile, output impedance matching is also achieved. Based on TSMC 0.35{\mu}mSiGe BiCMOS process, the topology and chip layout of the proposed LNA aredesigned and post-simulated. The LNA achieves the noise figure of 2.3~4.1dB,gain of 18.9~20.2dB, gain flatness of \pm0.65dB, input third order interceptpoint (IIP3) of -7dBm at 6GHz, exhibits less than 16ps of group delayvariation, good input and output impedances matching, and unconditionallystable over the whole band. The power consuming is only 18mW.