设计了一种应用于无线传感器网络RF射频前端芯片的可编程增益放大器(PGA)。该放大器由三级增益单元级联构成,每级单元均带直流漂移校正功能,7位数字端控制增益变化,且可灵活切断单级电源,降低PGA整体功耗。设计基于SMIC 0.18μm 1.8 V 1P6 M CMOS工艺。流片测试结果表明,该放大器工作性能良好,动态范围为0～60 dB,1 dB步进,增益以dB线性变化,最大可校正输入直流漂移为200 mV,直流漂移校正时间约为10μs,带宽为6 MHz,整体功耗仅为1.8 mW。 A programmable gain amplifier (PGA) is designed for RF front-end chip of wireless sensor networks. The amplifier consists of three levels of gain unit cascade, each unit with DC drift correction, digital control of 7-bit gain changes, and can be a flexible cut off single-stage power supply, reducing the overall PGA power consumption. The design is based on the SMIC 0.18μm 1.8 V 1P6 M CMOS process. The test results of the chip show that the amplifier has good performance with a dynamic range of 0-60 dB at 1 dB step with a linear gain variation of dB, a maximum of 200 mV DC offset of the input and a DC offset correction time of about 10 μs. The bandwidth At 6 MHz, the overall power consumption is only 1.8 mW.