Research And Design Of A CMOS Wireless Body Area Network Transceiver Integrated Circuit

The vigorous development of the medical field is inseparable from information and intelligent electronic equipment products.Integrated circuit technology plays an irreplaceable role in human health care.Wireless Body Area Network(WBAN)technology has been rapidly developed in the medical field since the approval of the IEEE 802.15.6 standard in 2012,and it has been employed in human body wear and implantation applications.It also has become a hot spot for scholars to research.Among the communication network sensor nodes,the wireless transceiver module usually occupies the maximum cost and energy consumption.In order to solve this problem,combing with human power radiation absorption and WBAN standards,a 402?614MHz low-power wireless transceiver is proposed and designed in this thesis in standard 0.18?m CMOS technology.The receiver adopts the low intermediate frequency(low-IF)architecture after analyzing and comparing the performance of each structure,such as cost,power consumption,frequency conversion and conversion gain.The receiver mainly including a low-noise amplifier,a mixer,a complex filter and a programmable gain amplifier.Cross-coupling capacitor technique and current reused technique is employed in LNA to increase the gain and reduce the power consumption;the mixer adopts a folded Gilbert mixer to down-convert the RF signal of 402?614MHz to IF signal of 2MHz,reduce the flicker noise of the mixer switch stage at the same time;The-2MHz intermediate frequency image signal is suppressed by the image complex filter with manual calibration and it has relized accurate frequency selection of the 2MHz.The intermediate frequency four-stage programmable gain amplifier is a tradeoff between gain,bandwidth,linearity and power consumption.The two techniques(closed loop and open loop)are combined in this PGA to obtain the two advantages of both of them at the same time.For the requirements of low power consumption and low transmission rate,the transmitter adopts a direct up-conversion transmitter,which mainly includes an up-conversion mixer,a power amplifier.Among them,the two stages of the power amplifier adopt Class A and Class AB power amplifier structures,respectively,and use a series of high linearity techniques to increase the output 1d B compression point to meet the high linearity requirements at the transmitting end.After cascading simulation of the receiver and transmitter circuit modules,the results show that the excellent impedance matching(<-16 d B)over the band of 402?614MHz can be achieved in consideration of representative process corners,and the image rejection ratio of the complex filter reaches above-42 d B,the programmable gain amplifier achieves a gain range of 0 ? 50 d B,the overall gain range of the receiver can reach 35 ? 85 d B,the overall noise figure of the receiving end is 7d B probably,and the overall power consumption of the receiving end under the voltage of 1.8V is 7.95 m W.At the transmitting end,a gain of nearly 10 d B can be achieved.The 1d B compression point of the PA's output is 3.24 d Bm and 2.11 d Bm at the frequency of 402 MHz and 614 MHz,respectively,which meets the high linearity requirements of the transmitting end.The overall power consumption of the transceiver is 16.35 m W.The size of receiver and transmitter are 1335.1?m×739.8?m and 595.9?m×510.2?m,respectively.All the simulation results of each process corners can meet the WBAN transceiver system index requirements.