Design Of Key Modules In Multi-mode Multi-standard Receiver RF Front-end Resilient To Out-of-band Blockers

With the development of wireless communication technology,a wideband receiver for multi-standard communications has been a research focus.Unlike the traditional narrowband receivers,wideband receivers are more likely to be jammed by blockers without off-chip filters.Thus blocker tolerability is critical.This dissertation focuses on the research and design of wideband low noise amplifiers(LNAs),mixers and dividers in wideband blocker-tolerant receiver front-end.Implemented in IBM 0.13?m BiCMOS process,three LNAs are presented and common base LNA is choosen as the final scheme.The common base LNA has two gain stages.The output impedence is high for high blocker rejection ratio(BRR)in high gain mode,inductive-peaking technique is used here to get high bandwidth and low noise figure.The linearity is high in low gain mode.Combing the benefits of single balance and double balance mixer,a quadrature down-conversion passive mixer is presented.The mixer can form a high-Q radio frequency(RF)band pass filter at the output of the LNA,together with the baseband capacitors.Thus the blockers can be filtered.A divider is desighed to generate 25%duty cycle non-overlappeing LO pulses,which is used to drive the mixer.A linear buffer is designed for measurement.The front-end can work from 0.92 GHz to 2.4 GHz at 1.8 V and 2.7 V supply voltages,while the active area is 0.32mm~2.Working in high gain mode,the circuit achieves 3.75 dB NF and 16.5 dB BRR at 80 MHz offset.It tolerates 0 dBm blockers at 80 MHz offset with acceptable 14.7 dB NF.The front-end achieves-1.4 dBm out-of-band IIP3 and-1.7 dBm out-of-band PI dB when work in low gain mode.