●●● ●●●● ●●●● Application: ●●●● ●●●● ●●●● n receivers在接收机中 ●●●● ①rejection signals outside the operating band.把带外信号反射 ②attenuating undesired mixer products..衰减不需要的混频分量 ③Setting the IF bandwidth of the receiver.设置接收机中频带宽 In transmitters在发射机中 Dto control the spurious response of upconverting mixers. 控制上变频器的杂散响应 ②to select the desired sidebands..选择需要的边带 ③to limit the bandwidth of the radiated signal.限制辐射信号 的带宽 3Application: In receivers 在接收机中 ①rejection signals outside the operating band.把带外信号反射 ②attenuating undesired mixer products.衰减不需要的混频分量 ③Setting the IF bandwidth of the receiver.设置接收机中频带宽 In transmitters 在发射机中 ①to control the spurious response of upconverting mixers. 控制上变频器的杂散响应 ②to select the desired sidebands.选择需要的边带 ③to limit the bandwidth of the radiated signal.限制辐射信号 的带宽 3