发明授权
- 专利标题: Digital baseband carrier recovery circuit
- 专利标题(中): 数字基带载波恢复电路
-
申请号: US110462申请日: 1980-01-08
-
公开(公告)号: US4348641A公开(公告)日: 1982-09-07
- 发明人: Lex A. Scott , William H. Mosley, Jr. , Carl F. Andren
- 申请人: Lex A. Scott , William H. Mosley, Jr. , Carl F. Andren
- 申请人地址: TX Dallas
- 专利权人: E-Systems, Inc.
- 当前专利权人: E-Systems, Inc.
- 当前专利权人地址: TX Dallas
- 主分类号: H04L27/22
- IPC分类号: H04L27/22 ; H04L27/00 ; H04L27/227 ; H04L27/233 ; H03D3/00 ; H03K9/00
摘要:
A recovery loop includes an analog circuit that mixes a fixed frequency signal from a temperature controlled oscillator (20) with an IF input to produce product signals corresponding to the quadrature components of data signals with frequency offset. A digital complex multiplier (32) is responsive to the product signals and to the output of a number controlled oscillator (34) to produce a digital output corresponding to the data signals. The output of the number controlled oscillator (34) is controlled by a digital phase lock loop.
公开/授权文献
- USD424960S Marking stake 公开/授权日:2000-05-16
信息查询