Design Of High-Performance,Small-Area RF Front-End Circuits For BLE Applications

With the popularization of all kinds of mobile communication terminals,Bluetooth devices withlow power consumption and small size,has more and more application scenarios and broad market perspective,becoming a significant short-range wireless communication standard.Radio frequency transceiver is one of the important components of Bluetooth,which determines the ability of Bluetooth chips to receive and receive information,and has important research significance.This thesis study the design of a RF transceiver’s front-end circuit transceiver based on 40nm CMOS technology,which is used in Bluetooth LE.The research focuses on the power amplifier(PA)as the transmitting front end and the low noise amplifier(LNA),mixer and complex filter circuits that together constitute the receiving front end.The main contents are as follows:1、The architecture of power amplifier and receiving front-end is analyzed,and based on the design objectives of high integration,low power consumption and low linearity requirements,Class E power amplifier and low IF architecture are selected for design.After that,according to the overall index requirements and other module circuit requirements,the performance index of the circuit designed in this paper is determined.2、A class E PA circuit with small area and high efficiency is designed,with an area of0.31mm~2.The maximum output power in the post-simulation is 6.60d Bm.At this time,the additional power efficiency is 41.22%.A 4-16 decoder is used to realize the controllable output power.The built-in matching network of the circuit simplifies the circuit structure and optimizes circuit performance through parasitic capacitance.3、A receiver front-end circuit with small area,low noise figure and high conversion gain is designed.The low noise amplifier uses a common gate input structure with noise cancellation,and simultaneously realizes input matching and noise matching through an inductor.LNA also uses current multiplexing technology to reduce power consumption and generate current output as transconductance..The mixer uses the substrate bias method to suppress the influence of bulk effect,and reserves the working point adjustment option to overcome the simulation error of CMOS device model in large signal and increase robustness.Complex filters can freely adjust the center frequency and bandwidth of the passband,adapt to different protocols of BLE,and achieve variable gain.In the post-simulation,the input echo loss of the receiver is-14 d B,the conversion gain is 80.44 d B,the noise coefficient is 4.48 d B,the input third-order intermodulation point is-21.8 d Bm,the area is 0.21 mm~2,and the power consumption is 2.67 m W.