摘要
本文研制的多路射频自动切换与下变频器采用新型低噪放大电路、射频功率检测电路、低插损切换电路、低噪本振信号源和无源混频器组成,实现了对微弱信号的低噪放大、功率检测、信号自动切换和下变频处理。升级改造后的移动直播数字微波专网传输系统传输信号清晰、流畅,最大传输距离达到了44km,大大改善了传输覆盖效果。
“Multi-channel RF automatic switching and down converter”developed in this paper consists of a new type of low-noise amplifier circuit,RF power detection circuit,switching circuit with low insertion loss,low-noise local oscillator signal source and passive mixer,which realizes low-noise amplification,power detection,signal automatic switching and down conversion processing for weak signals.The upgraded mobile live digital microwave private network transmission system has clear and smooth transmission signals,and maximum transmission distance reaches 44 km,which greatly improves transmission coverage effect.
作者
刘玮霞
Liu Weixia(Wuxi Broadcasting Television Group,Jiangsu 214061,China)
出处
《广播与电视技术》
2022年第2期107-112,共6页
Radio & TV Broadcast Engineering
关键词
下变频
射频检测
低噪放大
窄带滤波
自动切换
Down conversion
Radio frequency detection
Low-noise amplification
Narrowband filtering
Automatic switching
