摘要
功率放大器是大功率器件,其自身会消耗大部分的功耗,并导致功率放大器芯片的温度在一个很大的范围内变化,因此功率放大器的控制电路需要对环境温度的变化不敏感。针对这一要求,设计出一个对温度不敏感的全差分CMOS运算放大器,该运算放大器采用TSMC 0.18μm工艺,选用折叠式共源共栅、宽摆幅偏置电路结构。在负载电容为10 pF条件下,最大直流增益达到115 dBm,相位裕度为70°;在整个温度范围内(-40^+125℃)运算放大器的增益变化仅为1 dBm,相位裕度仅变化5°,满足设计要求。
The power amplifier is a high-power device, which can consume most of the power, and change the temperature of the chip in a large extent, therefore, the output power control circuit of PA should be insensitive to the change of ambient temperature. A temperature-insensitive and fully differential CMOS operational amplifier is designed based on TSMC 0.18/1m process, and it consists of folding cascode opamp and wide-swing bias circuit. The maximum DC gain up to ll5dBm and the phase margin is 70 degrees under the conditions that load capacitance is 10p; the gain variation is only ldBm and the phase margin is only 5 degrees in the entire temperature range （-40~＋125℃ ）.
出处
《现代电子技术》
2010年第14期4-6,共3页
Modern Electronics Technique
关键词
全差分运算放大器
负载电容
增益
相位裕度
fully differential operational amplifier
load capacitance
gain
phase margin
