Image reject transceiver and method of rejecting an image

Details Image reject transceiver and method of rejecting an image Image reject transceiver and method of rejecting an image

1997-12-24

2000-10-24

Hunter, Daniel S.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455302, 455304, 455 82, 455 76, 375327, H04B 110, H04B 146, H04B 140, H03D 318

Patent

active

061379999

ABSTRACT:
An image reject transceiver (10) provides both phase and gain adjustments that causes unwanted images to be rejected. A reference signal (RF.sub.IN) is frequency translated by two mixer circuits (28, 34) in a receiver circuit (16) to provide both an in-phase and an out-of-phase replica signal of the reference signal (RF.sub.IN) during normal operation. In a calibration mode a single frequency generated by a transmitter VCO (22) replaces the reference signal (RF.sub.IN). A phase detector circuit (38) provides a phase difference value that is fed back through a first switch (45) to a phase shift circuit (36) for adjusting the phase separation between the two replica signals. An amplitude detector circuit (40) provides an amplitude error value that is fed back through a second switch (47) to the mixer circuit (34) for adjusting and matching the gain of the two replica signals.

REFERENCES:
patent: 2964622 (1960-12-01), Fire
patent: 4105975 (1978-08-01), Sanders et al.
patent: 4903257 (1990-02-01), Takeda et al.
patent: 5081650 (1992-01-01), Hasegawa et al.
patent: 5802463 (1998-09-01), Zuckerman

Affiliated with

Also associated with

Rating

Image reject transceiver and method of rejecting an image does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image reject transceiver and method of rejecting an image, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image reject transceiver and method of rejecting an image will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1974235