LimeSDR support fixed-point or float-point

I`m beginner. Can you tell me limesdr uses floating point or fixed point? Thanks

Internally it’s all fixed point, but it can return 12 bit signed, 16 bit signed, or single-precision float results. I assume the conversion is done in the FPGA.

Nope, conversion is done in API. FPGA and LMS7002M deals with 12 bit 2’s complement data.