Low IF receiver of rejecting image signal and image signal...

Details Low IF receiver of rejecting image signal and image signal... Low IF receiver of rejecting image signal and image signal...

2011-01-18

2011-01-18

Nguyen, Lee (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S302000

Reexamination Certificate

active

07873342

ABSTRACT:
Provided are an image signal rejection method capable of avoiding demodulation of an image signal along with a real signal in a radio frequency (RF) signal and a low IF receiver of rejecting an image signal by using the method. The low IF receiver of rejecting an image signal includes a low noise amplifier, a quadrature I/Q mixer, a signal complex filter, and a phase and gain control block. The low noise amplifier amplifies a radio frequency (RF) signal. The quadrature I/Q mixer generates an I signal and a Q signal by down-converting the amplified RF signal into an IF signal. The phase and gain control block generates an I′ signal and a Q′ signal which are obtained by changing phases and amplitudes of the I signal and the Q signal by using a real signal. The signal complex filter minimizing the image signal in the IF signal and passing the real signal by performing filtering on the I′ signal and the Q′ signal.

REFERENCES:
patent: 6892060 (2005-05-01), Zheng
patent: 2008/0132191 (2008-06-01), Quinlan et al.

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