为啥激励换能器和接收换能器要用一个806电阻匹配？我们这里不应该是激励功率最大，接收电压最大更好吗？不应该是发送端直接接激励换能器，接收端不用并联806到地，直接电容耦合到运放放大器同相端吗？希望TI工程师能帮我解答一下，十分感谢！！！
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