公开(公告)号：JPH11251947A

公开(公告)日：1999-09-17

申请号：JP36097198

申请日：1998-12-18

Applicant: MOTOROLA INC

Inventor： DAVID KEVIN LABRAIS ,  MCGINN MICHAEL

IPC: H04B1/40 ,  H03D3/00 ,  H03D7/16 ,  H03D7/18 ,  H04B1/10 ,  H04B1/26 ,  H04B1/28

Abstract: PROBLEM TO BE SOLVED: To provide an image removal transmitter-receiver for adjusting the both of a phase and a gain and removing unrequired images. SOLUTION: During a normal operation, by two mixer circuits 28 and 34 inside a reception circuit 16, a reference signal RFIN is frequency-converted and the same phase and out-of-phase replica signals of the reference signal RFIN are provided. In a correction mode, a signal frequency generated by a transmission VCO 22 is replaced with the reference signal RFIN. A phase detection circuit 38 provides a phase difference value, it is fed back through a first switch 45 to a phase shift circuit 36 and phase separation between the two replica signals is adjusted. An amplitude detection circuit 40 provides an amplitude error value, it is fed back through a second switch 47 to the mixer circuit 34 and the gain of the two replica signals is adjusted and matched.