Termination pair for a differential driver-differential receiver input output circuit
AssigneeIntel Corporation
InventorChaiyuth Chansungsan
Life of this patent
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Abstract
Various apparatuses and methods are described that include a variable-impedance matched termination pair coupled to differential signaling bus pair. In an embodiment, the differential signaling bus pair includes a first bus and a second bus. The variable-impedance matched termination pair includes a first variable-impedance component and a second variable-impedance component. The impedance value of each variable-impedance component depends on the voltage level sensed by that variable-impedance component. The first variable-impedance component couples to the first bus. The second variable-impedance component couples to the second bus. The first variable-impedance component is electrically isolated from the second variable-impedance resistor.
Claims30
An apparatus, comprising:
- a differential signaling bus pair including a first bus and a second bus;
- and
- a variable-impedance matched termination pair including a first variable-impedance component and a second variable-impedance component electrically isolated from each other and coupled to the first bus and second bus respectively, wherein the impedance value of the first variable-impedance component depends on the voltage level on the first bus, wherein the impedance value of the second variable-impedance component depends on the voltage level on the second bus.
An apparatus, comprising:
- a power supply;
- a differential signaling input-output circuit having an output;
- and
- a resistive termination pair matched for both a differential signal and a common mode noise signal, the resistive pair including at least one component having a variable-impedance dependent on a voltage level sensed at the output of the differential signaling input output circuit, the resistive termination pair coupled to the output and the power supply.
A method, comprising:
- varying impedance in an impedance matched termination pair based upon the voltage level sensed at the output of a differential input output circuit;
- and
- impedance matching a differential signal and a common mode noise signal throughout substantially the entire differential signal swing.
An apparatus, comprising:
- means for varying impedance in an impedance matched termination pair based upon the voltage level sensed at the output of a differential input output circuit;
- and
- means for impedance matching a differential signal and a common mode noise signal throughout substantially the entire differential signal swing.
A computer system, comprising:
- one or more integrated circuits containing one or more differential signaling input-output circuits, each differential signaling input-output circuit having an output;
- and
- at least one of the one or more differential signaling input-output circuits coupling to a variable-impedance matched termination pair that includes a first variable-impedance component and a second variable-impedance component, the first variable-impedance component coupling to the first bus, the second variable-impedance component coupling to the second bus, the impedance value of the first variable-impedance component depends on the voltage level on the first bus, the impedance value of the second variable-impedance component depends on the voltage level on the second bus.
An apparatus, comprising:
- a differential signaling bus pair including a first bus and a second bus;
- a variable-impedance matched termination pair including a first variable-impedance component and a second variable-impedance component, the first variable-impedance component coupling to the first bus, the second variable-impedance component coupling to the second bus, the first variable-impedance component is electrically isolated from the second variable-impedance component, the impedance value of the first variable-impedance component depends on the voltage level on the first bus, the impedance value of the second variable-impedance component depends on the voltage level on the second bus, and the variable-impedance matched termination pair impedance matches a differential signal throughout substantially the entire differential signal swing.
Dependencies are inferred from the claim text.