阿什比是一位工程师，他对非线性控制电路和主动反馈回路的优点感兴趣。

Ashby was an engineer interested in nonlinear control circuits and the virtues of positive feedback loops.

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智能天线子系统中，射频前端模块包括线性功率放大器，低噪放大器，检测控制电路。

In intelligent peripheral subsystem, Radio Frequency Front Modules include linear power amplifier, low noise amplifier and detection control circuit.

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在实验方面，选用一个成品窄带滤光片，设计步进电机控制电路，实现了一个线性调谐光滤波器装置。

Experimentally, a linear tuning filter's set including a finished product narrowband thin-film interference filter and control circuit of stepping motor has been designed.

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