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测电流可用某种芯片吗?

Other Parts Discussed in Thread: INA138

我想测试0~100mA的电流,一个简单的方法就是用1欧姆电阻串联到电路里。用AD转换器测出压差,再除以电阻,就得到电流
有别的方法吗?哪些种类的芯片可以直接解决测电流的问题,无需电阻?
有人向我推荐了霍尔电流传感器,看了Allegro的产品,发现没有符合量程范围的。德州仪器有没有?
或者其他类型能测电流的芯片?
电流型AD转化器可以吗?