external feedback type oscillator circuit

例句：

1. 1. The external feedback type oscillatorcircuit is used to detect the presence ofa signal in a communication channel.
   外部反馈类型振荡器电路用于检测通信信道中信号的存在。
2. 2. The external feedback type oscillator circuit was developed to improve theaccuracy of frequency measurement.
   外部反馈类型振荡器电路被开发出来以提高频率测量的准确性。
3. 3.The external feedback type oscillator circuitis commonly used in wireless communication systems.
   外部反馈类型振荡器电路在无线通信系统中常被使用。