设计了基于单片机和RS - 485的手持操作通讯面板在有源滤波器中应用设计。

Is designed based on Microcontroller and RS-485 hand-held operation of communications panel in active filters applications.

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本文介绍单片晶体滤波器在移动通讯设备中的用途及特点，给出了其设计的基本方法。

In this paper, the feature and application of Monolithic Crystal Filter (MCF) in mo-bile Communication equipments is introduced. The method of MCF design is given.

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描述了基于AT89C52单片机、锁相环和开关电容滤波器的正交信号发生器的设计和实现方法。

The design and implementation of quadrature waveform generator are described based on the AT89C52, phase-locked loop(PLL) and switched-capacitor filter(SCF).

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