To against the fact of the commercial available white noise generators are very expensive which is not good for general operations,a simple and effective limited band white noise generator is design.The generator is using the feature of dual polarity transistor,i.e.,the power spectrurn density of particulate noise is not related to frequency in very wide band and close to white noise.The concrete circuit is also given.%针对市售白噪声发生器价格昂贵，不利于一般场合使用的问题，介绍利用双极性晶体管散粒噪声功率谱密度在非常宽的范围内与频率无关，属白噪声这一特性，设计了一种简捷、有效的限带白噪声发生器，并给出了具体电路。
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