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本文介绍一种对周期性干扰噪声有较强抑制能力的锁相式采样法,论述了该方法的理论依据,并给出了实用锁相控制电路。该电路可以很方便地嵌入通常的数据采集系统。
In this paper, we introduce a phase-locked sampling method that has a strong ability to restrain periodic interference noise. The theoretical basis of this method is discussed, and a practical PLL control circuit is given. The circuit can be easily embedded in the usual data acquisition system.