摘要
针对GPS接收机易受不同传输距离和多路径衰减效应的影响使得接收的信号强度不固定的问题,基于TSMC0.18μm互补金属氧化物半导体(CMOS)工艺设计一款可变增益放大器:它与脉冲宽度调制式自动增益控制和脉冲宽度译码器组成的自动增益控制电路保证接收信号强度输出的稳定;该电路的核心结构由五位二进制码控制五级级联放大电路来产生不同的增益。仿真结果表明:当电源电压为1.8V时,总的增益最小为14dB,最大可以达到73dB;并且在各个工艺角下增益误差都小于5%,噪声系数为19.68dB;输入1dB压缩点为—22.14dBm。
Aiming at the problem that it is susceptible to different transmission distances and multipath attenuation effect for GPS receivers,leading to the unstable intensity of the received signal,the paper designed a variable gain amplifier based on the technique of TSMC 0.18μm CMOS:the automatic gain control circuit which consists of an amplifier,a pulse width modulation automatic gain controller and a pulsewidth decoder ensured the stable intensity output of the received signal;moreover,as the central structure of the circuit,the 5-class cascade amplifier circuit was controlled by programmable 5-bit binary code to generate different gains.Simualtional result showed that:when the circuit supply voltage is set at 1.8 V,its overall gain would be 14 dB at least and 73 dB at most,and the gain errors could be less than 5%in every process corner,with the noise figure 19.68 dB;the compression point would be-22.14 dBm when the input is 1 dB.
作者
黄敏
黄海生
李鑫
王嘉齐
HUANG Min;HUANG Haisheng;LI Xin;WANG Jiaqi(School of Electronic Engineering,Xi′an University of Posts and Telecommunications,Xi′an 710121,China)
出处
《导航定位学报》
CSCD
2019年第1期98-102,共5页
Journal of Navigation and Positioning
基金
国家自然基金项目(61661049)
关键词
可变增益放大器
互补金属氧化物半导体工艺
增益可控性
增益范围
自动增益控制
variable gain amplifier
complementary metal-oxide-semiconductor(CMOS)technology
gain controllability
gain range
automatic gain control
