Local oscillation buffer and method for correcting phase mismatch

The invention provides a local oscillation buffer with phase mismatch correction. The buffer comprises: an input module which is used for receiving I signal and Q signal and processing the I signal and the Q signal into signals with equal amplitude; a conversion module which is used for summing and differencing on the I signal and O signal with equal amplitude to respectively obtain a sum signal and a difference signal; an output module which is used for outputting one of the sum signal and the difference signal as a new I signal I' and the other as a new Q signal Q'. The local oscillation buffer realizes the technical effect of simply correcting the phase mismatch of I and Q branches.