A Low-power RF Receiving Front-end Circuit Designed For Bluetooth Transceiver

Thanks to the concept of the Internet of Things(Io T)more frequently applied in our daily lives,Bluetooth mobile devices with portable and long battery life characteristics designed for Io T have been widely used.These devices are usually supplied by a battery for portability.Though the battery capacity has achieved huge improvement owning to the development of battery technique,decreasing the power of circuits is the everlasting topic of a large number of well-known research institutions in the world.In the entire Bluetooth device circuit,the RF receiver front-end circuit is an important module,not only in terms of function but also in terms of overall power consumption.Therefore,it is of great significance to study low-power radio frequency receiver circuits with higher current utilization efficiency.This thesis presents a highly efficient low-intermediate frequency receiver frontend for Bluetooth transceiver.The front-end circuit consists of a low noise transimpedance amplifier,mixer,and image-reject trans-impedance amplifier.The low noise trans-impedance amplifier(LNTA)combines a transformer-based network for scaling up the input impedance together with passive gm-boosting and current-reuse techniques to achieve better noise and 24× current saving compared with a common-gate(CG)stage.The high output resistance is presented in the output node to drive following passive mixers and TIA in the popular current-mode structure.The mixer adopts a passive mixer structure and uses a local oscillator signal with a 25% duty cycle to resist I/Q-crosstalk.A complex channel-selection filter with center frequency and passband of 2 and 1 MHz,respectively,is implemented after the passive mixer with a gm-boosted CG stage.Built-in 65-nm CMOS,it is supplied with 1.2V and consumes only 158(?)W,while showing a minimum NF of 9.7 d B,IIP3 of-26.3 d Bm,and 16 d B of IR at the channel of interest.The RF performance of the proposed receiver is very competitive with the state-of-the-art ultralow-power receivers,while it consumes the lowest power.