 Plural comparator indicator of battery voltage |
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| Charge status indicator |
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| Method of determining and displaying battery charge status |
| OF EMBODIMENTS Referring first to FIG. 1 of the drawings, a load 2 is concerned to a battery (... |
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| Status indicator for battery charger |
| What is claimed is: 1. Apparatus for indicating multiple operating states of a battery charger ... |
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| Method of and apparatus for setting battery alarm voltage in battery management server |
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| Disabling circuit for an iontophoretic system |
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| Two lead universal defibrillation, pacing and sensing system |
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| Power supply system for portable electronic devices |
| Accordingly, it is an object of the present invention to provide a novel power supply system for a ... |
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| Intelligent power management for rechargeable batteries |
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Adaptive per-pair skew compensation method for extended reach differential transmission
| Details |
Inventors: Dyer, Kenneth C.; Takatori, Hiroshi;
Assignee: KeyEye Communications (Sacramento, CA)
Primary Examiner: Patel; Jay K.
Assistant Examiner: Odom; Curtis
Attorney, Agent or Firm: Lumen Intellectual Property Services, Inc.
High speed data transmission schemes often use differential lines to reduce the effect of noise on the data signal. Unfortunately, the signal propagation on the positive and negative lines may be different, which leads to a signal skew problem. This document describes a novel way of compensating for differential line skew in data transmission lines. |
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DETAILED DESCRIPTION What is claimed is: 1.
A differential transmission de-skew system comprising: a first delay block; a second delay block; an output port; a first subtracter, the first subtracter subtracting an output of the second delay block from an output of the first delay block, where an output of the first subtracter comprises an analog differential signal; at least one slicer, the at least one slicer converting the analog differential signal to a digital signal, the digital signal exiting through the output port; and a second subtracter, the second subtracter subtracting the analog differential signal from the digital signal, wherein the first delay block comprises a plurality of delay cells.
2.
The system of claim 1, wherein delays introduced by the first and second delay blocks are fixed to a system clock.
3.
The system of claim 1, wherein delays introduced by the first and second delay blocks are variable relative to a system clock.
4.
The system of claim 1, wherein a delay introduced by a given delay cell is less than a baud time.
5.
The system of claim 1, wherein the system receives signals from positive and negative leads of a differential transmission cable.
6.
The system of claim 5, wherein the system removes skew between the positive and negative signals.
7.
The system of claim 6, wherein the system adaptively adjusts to remove skew.
8.
The system of claim 1, further comprising a closed feedback control loop, the control loop adjusting at least one delay block in order to minimize skew of signals propagating through the system.
9.
The system of claim 1, wherein the second delay block comprises at least one delay cell.
10.
The system of claim 1, wherein the analog signal comprises a pulse amplitude modulated signal with at least two levels.
11.
The system of claim 1, further comprising an adaptive algorithm block, the adaptive algorithm adjusting delay coefficients of the first and second delay blocks.
12.
The system of claim 11, wherein inputs to the adaptive algorithm include incoming line data, output data, and data error
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Electrical and Wave 
