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

With the development of the long-distance wireless communication technologies,the design of communication terminals becomes more and more complicate,The degree of integration,bandwidth,power consumption,and anti-blocking performance are still difficulties and bottlenecks in design.As the first stage of RF receiver,anti-blocking RF front-end circuit blocking performance is more and more important.In this thesis,we focuses on the research of key modules of receiver RF Front-end.Including the wideband low noise amplifiers(LNA),impedance transfer network which consist of passive mixer and baseband capacitor,and buffer.Implemented in TSMC 0.18μm RF CMOS process,the design of the RF front-end module for 0.9GHz ~ 2.4GHz multi-mode multi-standard anti-jamming receiver is completed.In this thesis,several structure of RF receiver resilient to out-of-band blockers is analyzed and compared,and choose the voltage-mode structure.The wideband low noise amplifier designed in this thesis is based on common-gate structure,the capacitive cross-coupling enhances transconductance.Negative feedback with the source inductor to improve linearity,the peak inductor to increase the gain.Combing the benefits of single balance and double balance mixer,a double-balanced four-phase passive mixer is presented.The mixer and baseband capacitors form the impedance transfer network.The local oscillator signal is non-overlapping ideal signal with 25% duty cycle.The impedance transfer network is combined with LNA to achieve anti-blocking performance.Finally,A buffer is designed to achieve output matching.The circuits and layout of each module are designed by Cadence Virtuso.According to the simulation results,the front-end can work from 0.9GHz~2.4GHz at 3.3V supply voltages,the noisefigure of the circuit is less than 4.5dB,the VCG is greater than 15 dB,S11 and S22 are both less than-10 dB,and it achieves greater than 10 dB BRR at 80 MHz offset.The designed receiver RF Front-end tolerates 0 dBm blockers at 80 MHz offset with acceptable 8.99 dB NF,which meets the requirements of the front-end for RF receivers.