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VCA810幅频特性曲线为何13M左右出现严重尖峰

Other Parts Discussed in Thread: VCA810

今天做了两块相同的VCA810的板子,但都出现了一个严重的情况,就是在扫频仪输出的幅频特性曲线中13M的地方出现了严重的尖峰

输入信号为10mV左右,但无论怎么改变输入信号大小,尖峰不变,能改变尖峰大小的唯一途径就是Vc端,Vc端电压越靠近-2V,尖峰越明显,下面上图