Direct conversion RF signal receiver, has mismatch estimation unit to adjust phase mismatch of poly-phase filter, in-phase mixer and quadrature- phase mixer, in response to output signal of mismatch estimation unit

摘要

#CMT# #/CMT# The receiver has a mismatch estimation unit (550) to estimate a phase mismatch of a poly-phase filter (130), or an in-phase mixer and a quadrature-phase mixer (521, 520), from output signals of the in-phase mixer and the quadrature-phase mixer. The unit adjusts the phase mismatch of the poly-phase filter, in-phase mixer and the quadrature- phase mixer, in response to an output signal of the mismatch estimation unit. #CMT#USE : #/CMT# Used for receiving a radio frequency (RF) signal. #CMT#ADVANTAGE : #/CMT# The mismatch estimation unit estimates and calibrates the phase mismatch or gain mismatch, thus minimizing distortion of a converted radio frequency RF signal of the receiver. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a block diagram of a structure of a direct conversion receiver when a phase and gain mismatch is estimated. 130 : Poly-phase filter 521, 522 : Mixer unit 523 : Variable gain adjuster 541 : Low pass filter 550 : Mismatch estimation unit.