Low noise, high linearity RF front end circuit is the key of the whole RF receiver system design.

低噪声、高线性度的射频前端设计是整个射频接收机系统电路设计中的关键。

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The coupled network based on the front end circuits selects specific signals of the local oscillators for each front end circuit.

基于前端电路将耦合到的网络，为每个所述前端电路选择特定的本机振荡器信号。

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The second one is integrated signal acquisition device made up of sensor, front end circuit, data-showing meter, USB data acquisition card and power supply.

集成式信号采集装置包括传感器、前置器、数显表头、USB数据采集卡和供电电源；

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By the end of the first circuit on Tuesday the three Kenyans had established themselves at the front, led by 19-year-old Kipruto, with Amer following their every move.

CNN: Steeplechase sweep for Kenyan trio