双积分型A/D转换电路中积分器的输出波形<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/4aac84b6989d48ecbbd442804ee67bfa.png?x-oss-process=image/sharpen,200"/>如下图所示，如果输出波形产生如虚线所示的变化，试分析其产生的原因是。<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/f2147f7cb80f42f9b6023b0a7ceec65f.jpeg?x-oss-process=image/sharpen,200"/>