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运放使用单电源好还是双电源好?



比如现在有一款AD623芯片,它是轨至轨输出仪表运放,可以单电源也可以双电源工作。但是在很多应用中没有负压,增加负压电路意味着增加成本,这时只能用单电源,在单电源进行传感信号的放大电路设计需要注意些什么?运放在单电源工作下不如双电源性能好吗?