变容二极管(Varactor Diodes)又称"可变电抗二极管"，是利用pN结反偏时结电容大小随外加电压而变化的特性制成的。反偏电压增大时结电容减小、反之结电容增大，变容二极管的电容量一般较小，其最大值为几十皮法到几百皮法，最大电容与最小电容之比约为5:1。
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