Method and apparatus for RF common-mode noise rejection in a DSL receiver
AssigneeTioga Technologies Inc.
InventorRoman Vitenberg
Life of this patent
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Abstract
A receiver for high-speed data communications, which receives a differential signal through a pair of signal lines. The receiver includes a common-mode choke, which has first and second signal windings, which are respectively coupled in series to the pair of signal lines so as to attenuate common-mode interference in the differential signal. The choke also has a sampling winding, which is inductively coupled to the signal windings so as to generate a sampled signal responsive to current flowing in the signal windings. Signal processing circuitry is coupled to receive the sampled signal from the sampling winding and to receive the differential signal from the signal windings and to process the differential signal responsive to the sampled signal.
Claims16
A receiver for high-speed data communications, which is adapted to receive a differential signal through a pair of signal lines, the receiver comprising:
- a common-mode choke, comprising:
- first and second signal windings, which are configured to be respectively coupled in series to the pair of signal lines so as to attenuate commonmode interference in the differential signal;
- and
- a sampling winding, which is inductively coupled to the signal windings so as to generate a sampled signal responsive to current flowing in the signal windings;
- and
- signal processing circuitry, which is coupled to receive the sampled signal from the sampling winding and to receive the differential signal from the signal windings and to process the differential signal responsive to the sampled signal.
A method for processing a differential signal received on a pair of signal lines, comprising:
- coupling a pair of inductive elements in series with the respective signal lines so as to attenuate common-mode interference in the lines relative to the differential signal;
- inductively sampling electrical currents in the inductive elements so as to generate a sampled signal;
- and
- processing the differential signal responsive to the sampled signal so as to enhance a signal-to-noise characteristic of the differential signal following the inductive elements.
Dependencies are inferred from the claim text.