  A low power cascode SiGe BiCMOS low noise amplifier (LNA) with current reuse
and zero-pole cancellation is presented for ultra-wideband (UWB) application.
The LNA is composed of cascode input stage and common emitter (CE) output stage
with dual loop feedbacks. The novel cascode-CE current reuse topology replaces
the traditional two stages topology so as to obtain low power consumption. The
emitter degenerative inductor in input stage is adopted to achieve good input
impedance matching and noise performance. The two poles are introduced by the
emitter inductor, which will degrade the gain performance, are cancelled by the
dual loop feedbacks of the resistance-inductor (RL) shunt-shunt feedback and
resistance-capacitor (RC) series-series feedback in the output stage.
Meanwhile, output impedance matching is also achieved. Based on TSMC 0.35{\mu}m
SiGe BiCMOS process, the topology and chip layout of the proposed LNA are
designed 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 intercept
point (IIP3) of -7dBm at 6GHz, exhibits less than 16ps of group delay
variation, good input and output impedances matching, and unconditionally
stable over the whole band. The power consuming is only 18mW.
