FM广播接收机辐射骚扰的抑制

Restraint of Radiation Disturbance for FM Broadcast Receivers

指出FM广播接收机在出口认证中,EMC测试不合格项出现机率最多的是辐射骚扰超出标准限值。可以在本振谐振回路向IC内部本地振荡器信号注入端口串连接入一只阻值合适的电阻,用降低本振振荡强度的办法,成功解决了辐射骚扰超出标准限值的问题,使在测装置顺利通过EMC测试,此方法既方便又经济。

The highest failure probability in EMC test is that radiation disturbance overruns the limitation of specification for FM broadcast receivers. A resistor which resistance is appropriate to circuit between the resonance loop and input port of local oscillator within IC can be connected. Using the method of reducing the intension of local oscillator, the problem that the radiation disturbance overruns the limitation of specification may be resolved successfully and EUT（Equipment Under Testing） may pass the EMC measurement. This method is convenient and economical.