发明授权
US07873342B2 Low IF receiver of rejecting image signal and image signal rejection method
有权
拒绝图像信号的低IF接收机和图像信号抑制方法
- 专利标题: Low IF receiver of rejecting image signal and image signal rejection method
- 专利标题(中): 拒绝图像信号的低IF接收机和图像信号抑制方法
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申请号: US11871008申请日: 2007-10-11
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公开(公告)号: US07873342B2公开(公告)日: 2011-01-18
- 发明人: Kyoo Hyun Lim , Sun Ki Min
- 申请人: Kyoo Hyun Lim , Sun Ki Min
- 申请人地址: KR Seongnam-si
- 专利权人: FCI Inc.
- 当前专利权人: FCI Inc.
- 当前专利权人地址: KR Seongnam-si
- 代理机构: Kile Park Goekjian Reed & McManus PLLC
- 优先权: KR10-2006-0102280 20061020
- 主分类号: H04B1/18
- IPC分类号: H04B1/18 ; H04K3/00
摘要:
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.