一种用于无线脑电信号检测系统的发射机电路

A transmitter circuit for wireless electroencephalogram system

设计了一款应用于无线脑电信号(EEG)检测系统的射频发射机芯片。该发射机采用标准的0.18μm CMOS工艺设计,主要包含锁相环(PLL)和功率放大器(PA)模块。锁相环电路中采用新型16/17预分频器结构以提高分频器的工作频率,同时压控振荡器采用数字调谐与模拟调谐相结合的方式拓宽了频率输出范围。测试结果显示,锁相环输出频率范围为2 225~2 580 MHz,锁定时间约为49μs,发射机采用高效率E类功率放大器,最大输出功率达-3.14 d Bm。发射数据采用二进制启闭键控(OOK)调制方式,最大传输速率可达5 Mbps。

A Radio Frequency(RF)transmitter circuit is designed for wireless Electro-Encephalo-Graph(EEG)system.The transmitter is manufactured in 0.18μm Complementary Metal Oxide Semiconductor(CMOS)process and it consists of two parts,Phase-Lock Loop(PLL)and Power Amplifier(PA).A novel 16/17 prescaler is proposed in PLL,which improves the circuit speed.The range of frequency is expanded in result of combining digital tuning with analog tuning.As is measured,the output has a wide range of frequency from 2 225 MHz to 2 580 MHz.The lock-time is about 49μs.The output power of the transmitter can achieve-3.14 dBm by using the class E PA.The transmitter utilizes On-Off Keying(OOK)with a max data rate of 5 Mbps.