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US 2013/0259175 A1Published application
Method and apparatus for generating a common-mode reference signal
Assignee2 Wire, Inc.
InventorsJames T. Schley-May, Richard Barry Angell
Life of this patent
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Abstract
A method and apparatus to generate a common-mode reference signal. A common-mode current is received at a common-mode current sensing circuit. The common-mode current is sampled at a node between the common-mode current sensing circuit and a shunt resistor. The resulting voltage across the shunt resistor from the applied common-mode current is used as a common-mode reference signal.
Claims17
An apparatus comprising:
- a common-mode current sensing circuit configured to receive a common-mode current;
- a shunt resistor coupled between the common-mode current sensing circuit and a first low supply node and wherein the common-mode current sensing circuit comprises an instant averager circuit and receives the common-mode current from a pair of signal lines, the pair of signal lines comprising a first signal line and a second signal line.
A method, comprising:
- receiving a common-mode current at a common-mode sensing circuit;
- and
- sampling the common-mode current at a node coupled between the common-mode current sensing circuit and a shunt resistor to generate a common-mode reference signal wherein receiving the common-mode current comprises receiving the common-mode current from a pair of signal lines, and wherein the common-mode current sensing circuit comprises an instant averager circuit, the instant averager circuit coupled to the pair of signal lines.
Dependencies are inferred from the claim text.