基于AD608芯片的对数中频低功耗接收机设计

Design of Logarithmic IF Receiver Based on AD608

AD公司推出的3 V低功耗接收机中频子系统芯片,它内含混频器,并带有限幅器和接收信号强度指示(RSSI)功能,具有动态范围大、精度高的技术特点。在此介绍了AD608芯片的功能原理,并详细阐述基于AD608的中频接收机的对数放大电路和中频滤波电路的设计与实现。最后通过实验表明中频接收机的动态范围达到了70 dB,检波输出信号的一致性在±1 dB内。

A 3 V low-power receiver IF subsystem chip by A/D Componay,which has mixer and RSSI,the principle of logarithmic amplifier AD608 which has high dynamic range and high accuracy is introduced.It has AD068 as main amplifier in the IF receiver,and expounds the circuit of logarithmic amplifier and IF filter.According to the experimental result,the IF receiver has 70 dB dynamic range,over this range the logarithmic conformance is typically±1 dB.