Hybrid timing recovery for burst mode receiver in passive optical networks
First Claim
1. An apparatus for coarse phase alignment of an analog signal comprising:
- a tapped delay line configured to output N delayed signals, wherein each delayed signal has a delay based on a bit period, N, and M;
a coarse phase alignment logic circuit coupled to the tapped delay line; and
a selector coupled to the tapped delay line and the coarse phase alignment logic circuit and configured to receive the N delayed signals, wherein N is an integer greater than 1 and M is an integer number of signals output from the apparatus.
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Accused Products
Abstract
An apparatus for coarse phase alignment of an analog signal comprising: a tapped delay line, a coarse phase alignment logic circuit coupled to the tapped delay line, and a selector coupled to the tapped delay and the coarse phase alignment logic circuit. An apparatus for timing and data recovery for burst mode receivers comprising: a receiver, a coarse phase alignment circuit coupled to the receiver, at least one analog to digital converter (ADC) coupled to the coarse phase alignment circuit such that the coarse phase alignment circuit is positioned between the receiver and the ADC, and a fine phase alignment circuit coupled to the ADC such that the ADC is positioned between the coarse phase alignment circuit and the fine phase alignment circuit, wherein the fine phase alignment circuit produces a recovered data output.
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Citations
19 Claims
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1. An apparatus for coarse phase alignment of an analog signal comprising:
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a tapped delay line configured to output N delayed signals, wherein each delayed signal has a delay based on a bit period, N, and M; a coarse phase alignment logic circuit coupled to the tapped delay line; and a selector coupled to the tapped delay line and the coarse phase alignment logic circuit and configured to receive the N delayed signals, wherein N is an integer greater than 1 and M is an integer number of signals output from the apparatus. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of burst mode clock and data recovery at an Optical Line Terminal (OLT) in a Passive Optical Network (PON), the method comprising:
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receiving an upstream analog signal; aligning a coarse phase for the upstream analog signal using a fractional delay circuit to create at least one coarse phase aligned analog signal, wherein the aligning comprises creating, from the upstream analog signal, N delayed signals, wherein each delayed signal has a delay based on a bit period, N, and M, wherein N is an integer number of first desired signals output to a selector, and wherein M is an integer number of second desired signals output to at least one analog-to-digital converter (ADC); converting the at least one coarse phase aligned analog signal to at least one digital signal; aligning a fine phase for the at least one digital signal to create a fine phase aligned signal; and outputting a recovered data signal based on the fine phase aligned signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for timing and data recovery for burst mode receivers comprising:
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a receiver; a coarse phase alignment logic circuit coupled to the receiver and comprising; a tapped delay line coupled to the receiver; a plurality of flip-flops coupled to the tapped delay line such that the tapped delay line is positioned between the receiver and the flip-flops, wherein the flip-flops are further coupled to a clock; a coarse phase alignment logic circuit coupled to the flip-flops such that the flip-flops are positioned between the tapped delay line and the coarse phase alignment logic circuit; and a selector directly connected to the tapped delay line and coupled to the coarse phase alignment logic circuit, wherein the coarse phase alignment logic circuit is positioned between the flip-flops and the selector, wherein the tapped delay line is positioned between the receiver and the selector; an analog-to-digital converter (ADC) coupled to the coarse phase alignment logic circuit such that the coarse phase alignment logic circuit is positioned between the receiver and the ADC; and a fine phase alignment circuit coupled to the ADC such that the ADC is positioned between the coarse phase alignment logic circuit and the fine phase alignment circuit, wherein the fine phase alignment circuit is configured to produce a recovered data output. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification