发明授权
- 专利标题: Multi-channel receiver with improved AGC
- 专利标题(中): 具有改进AGC的多通道接收器
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申请号: US11648702申请日: 2006-12-29
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公开(公告)号: US07978773B2公开(公告)日: 2011-07-12
- 发明人: Yhean-Sen Lai , Jie Song , Zhenyu Wang , Jinguo Yu
- 申请人: Yhean-Sen Lai , Jie Song , Zhenyu Wang , Jinguo Yu
- 申请人地址: US PA Allentown
- 专利权人: Agere Systems Inc.
- 当前专利权人: Agere Systems Inc.
- 当前专利权人地址: US PA Allentown
- 代理机构: Mendelsohn, Drucker & Associates, P.C.
- 代理商 Craig M. Brown; Steve Mendelsohn
- 主分类号: H04K27/00
- IPC分类号: H04K27/00
摘要:
An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, a primary AGC loop controls an analog sub-receiver adapted to simultaneously receive multiple signals. Multiple digital demodulators, coupled to the sub-receiver, demodulate the multiple received signals. Multiple secondary AGC loops, one for each received signal, compensate for variations in demodulated signal strengths caused by the primary AGC loop. A feed-forward AGC compensation technique generates scalar control values for scaling the demodulated signals before the demodulated signals are processed by the secondary AGC loops. This at least partially compensates for gain variations caused by the primary AGC, reducing received signal drop-outs before the secondary AGC loops can compensate for the gain variations. Because of systemic delays in the sub-receiver and the demodulators, the scalar control values are independently timed to be coincident with the variations in the demodulated signal strengths caused by the primary AGC loop.
公开/授权文献
- US20080159446A1 Multi-channel receiver with improved AGC 公开/授权日:2008-07-03
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