i use HMC544 for GPS application, switch the external antenna and inside antenna RF, i found the signal seems been mixed by HMC544, i can not turn off one of them via control A/B logic, who can help me? thanks a lot!
HMC544 requires complementary logic levels on A and B control inputs to select RFC to RF1 or RFC to RF2 path. Please refer to the tables below taken from the datasheet.
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