发明授权
- 专利标题: Direct conversion receiver
- 专利标题(中): 直接转换接收机
-
申请号: US10727612申请日: 2003-12-05
-
公开(公告)号: US07260373B2公开(公告)日: 2007-08-21
- 发明人: Yukinori Akamine , Satoshi Tanaka , Akio Yamamoto , Kazuaki Hori
- 申请人: Yukinori Akamine , Satoshi Tanaka , Akio Yamamoto , Kazuaki Hori
- 申请人地址: JP Tokyo
- 专利权人: Renesas Technology Corp.
- 当前专利权人: Renesas Technology Corp.
- 当前专利权人地址: JP Tokyo
- 代理机构: Reed Smith LLP
- 代理商 Stanley P. Fisher, Esq.; Juan Carlos A. Marquez, Esq.
- 优先权: JP2002-369773 20021220
- 主分类号: H04B1/10
- IPC分类号: H04B1/10
摘要:
In a direct conversion receiver, to cancel a DC offset generated in the baseband processing block, negative feedback arrangements comprising a gain control amplifier and a low-pass filter are respectively attached to the I and Q signal branches of the baseband block following mixer outputs. The gain control amplifier in each negative feedback circuit is gain adjusted so that the product G-B of the gain G of a primary gain control amplifier and its own gain B will be constant and thereby the DC offset is cancelled. This DC offset cancellation can be applied in a continuous receiving system with no intermittent time during a receiving operation. Capacitance elements located off-chip can be reduced to those to be used only in the low-pass filters in the negative feedback circuits, whereas many off-chip capacitance elements have been required to be inserted between each stage of gain control amplifiers in conventional baseband chains.
公开/授权文献
- US20040121746A1 Direct conversion receiver 公开/授权日:2004-06-24