发明授权
US06707868B1 Apparatus for recovering timing of a digital signal for a transceiver
失效
用于恢复收发器的数字信号定时的装置
- 专利标题: Apparatus for recovering timing of a digital signal for a transceiver
- 专利标题(中): 用于恢复收发器的数字信号定时的装置
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申请号: US09291136申请日: 1999-04-12
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公开(公告)号: US06707868B1公开(公告)日: 2004-03-16
- 发明人: John R. Camagna , James Ward Girardeau, Jr. , Stanley K. Ling , Hiroshi Takatori
- 申请人: John R. Camagna , James Ward Girardeau, Jr. , Stanley K. Ling , Hiroshi Takatori
- 主分类号: H04L700
- IPC分类号: H04L700
摘要:
A digital timing recovery system wherein the rate conversion is independent of the sampling rate, and which may be set in a network mode or a remote mode. The invention includes a transceiver core for processing transmit and receive data at a predetermined baud rate, an analog front end for transmitting and receiving analog signals over a network, a phase detector for generating a phase error estimate and a timing controller for receiving the phase error estimate signal and generating a receive and transmit phase control signal for controlling timing of the analog front end. A selector is provided for selecting a remote mode of operation or a network mode of operation. The analog front end further includes a transmit converter for converting the transmit data at the baud rate to a digital output at a transmit rate and a digital to analog converter for converting the digital output to an analog signal, and an analog to digital converter for converting the analog receive signal to a digital receive signal and a receive converter for converting the digital receive signal at a receive rate to the baud rate. The phase detector includes a channel estimator for generating a coefficient error signal and the timing controller includes a loop filter for producing a control signal for a numerically controlled oscillator that produces a baud interrupt signal and the phase control signals.
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