Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
I/Q demodulation is a common and useful technique used in accelerators. This paper presents a series of methods to correct phase errors based on the theories of the analog I/Q demodulator, which can correct various errors effectively. And based on this, we have done the relative experiments.