Method for suppressing disturbances in a bipolar data stream and a circuit configuration for carrying out the method
AssigneeInfineon Technologies AG
InventorMarkus Brandstetter
Life of this patent
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Abstract
Disturbances in a bipolar signal in the case of large line lengths are suppressed. The signal is led to a coarse setting and a fine setting in an equalizer and to a downstream level detector. From there it is fed back to the equalizer via a control device. Sampling is performed in this case with the aid of a measuring clock pulse. The sampling clock pulse is dimensioned such that undersampling is carried out. Three reference levels are used, from which one digital sampled signal is derived in each case. A coarse setting or fine setting is initiated as a function of a percentage-prescribed number of upper and lower threshold violations.
Claims10
A method of suppressing disturbances in a bipolar data stream transmitted through a long transmission line, which comprises:
- subjecting a disturbed, bipolar data stream to one of a coarse and fine adjustment in an equalizer;
- subsequently comparing the data stream with three reference levels in a level detector;
- forming a signal in case of a level violation of a reference level;
- sampling the signal in the level detector with a measuring clock pulse to form a digital sampled signal and supplying the digital sampled signal to a control device;
- stochastically evaluating the level violation represented by the sampled signal in the control device, and setting the equalizer with the control device as a function of the result of the evaluation, the setting comprising the following:
- coarsely setting the equalizer when a percentage number of level transgressions of a lower reference level undershoots a first lower decision threshold or when a percentage number of level transgressions of an upper reference level overshoots a first upper decision threshold;
- and
- finely setting the equalizer when the percentage number of level transgressions of the upper reference level undershoots the first upper decision threshold or when the percentage number of level transgressions of the lower reference level overshoots the first lower decision threshold.
A circuit configuration for suppressing disturbances in a bipolar data stream transmitted through a transmission line, comprising:
- an equalizer having an automatic gain controller for fine setting and a filter for coarse setting of a signal amplitude;
- a level detector connected to said equalizer via a signal line;
- a control device connected to said level detector via lines, said control device controlling said equalizer via a line;
- a tendency controller for influencing the fine setting and coarse setting connected to said control device via a bidirectional line;
- and
- a voltage peak detector connected to said equalizer and a receiver connected to said voltage peak detector and to said control device, said voltage peak detector and said receiver processing a data stream received from said equalizer via said signal line, feeding back the processed data stream to said control device, and outputting the processed data stream.
Dependencies are inferred from the claim text.