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锁相环CD4046 VCO电压受温度影响较大

如图所示,可以通过调节R20使TP1点为2.5V,那么此刻锁相环锁相,但当周围温度会发生变化时,电压也发生变化,呈现温度越高电压变低。而电阻的温漂较小,可以忽略。还有什么原因会导致这样的结果。