移动数字电视接收机中宽带RF RSSI的设计

基于UMC 0.18 μm RF CMOS工艺,设计并实现了一个应用于移动数字电视接收机射频前端的接收信号强度指示仪(RF RSSI).提出了一种全新的功率检测电路,相对于传统的非平衡源级耦合对整流器,具有设计简单、功耗低以及良好的宽带功率指示功能;电路中前置放大器采用恒定跨导(G<,m>)偏置技术,输出放大器为三运放...

Design of the Wideband RF RSSI for TV Tuner

Based on the UMC's 0.18 μm RF CMOS technology,a new RF RSSI for mobile TV tuner was designed and implemented.A new circuit for detecting the received signal power was proposed,which is of simple design,low power consumption and good performance in wideband frequency comparing to the traditional rectifier with the unbalance source-coupled pairs.The gains of the preamplifier with constant-Gm bias and the output amplifier(three op-amps instrument amplifier) both depend on a ratio of resistances,which are insensitive to process,thermal and power supply.Measurement results show that when the input signal frequency is between 470 MHz and 860 MHz,the RF RSSI can detect the input signal power from -25 dBm to-15 dBm with ±1.5 dB nonlinearity error,and the power dissipation is less than 7 mW from the 1.8 V power supply.Its performance can fully meet the demands of the whole system.