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A High Dynamic Range CMOS Variable Gain Amplifier for Mobile DTV Tuner
一种适用于移动数字电视调谐器的高动态范围CMOS可变增益放大器
16dB最大增益, 33dB增益控制范围, 4.3dB噪声系数, >25dBm IIP3
可变增益放大器CMOS移动数字电视高动态范围电流转向
▸基于电容衰减器和电流转向跨导级的高线性度设计
▸采用电阻并联反馈的宽带输入阻抗匹配方案
▸具有工艺和温度无关的1dB步进增益控制技术
Abstract
A high dynamic range RF variable gain amplifier (RFVGA) suitable for mobile digital television (DTV) tuners is presented. Variable gain is achieved using a capacitive attenuator and current-steering transconductance ( ) stages, which pro- vide high linearity with relatively low power consumption. A novel broadband input impedance matching scheme based on resistive shunt-feedback is proposed. This scheme allows the RFVGA to achieve a low noise figure. A gain control technique suitable for CMOS current-steering variable gain amplifiers is described; it features 1 dB per step resolution, independent of process and tem- perature variations. The chip is fabricated in six-metal 0.18 m CMOS technology and consumes 12.2 mA current from 1.8 V supply. The RFVGA achieves 16 dB maximum gain, 33 dB gain control range, a 4.3 dB noise figure, and an IIP3 higher than 25 dBm.