US 12,328,211 B2
Common mode noise measurement in a data communication interface receiver
Sandor Farkas, Round Rock, TX (US); and Bhyrav Mutnury, Austin, TX (US)
Assigned to Dell Products L.P., Round Rock, TX (US)
Filed by DELL PRODUCTS L.P., Round Rock, TX (US)
Filed on Jun. 28, 2023, as Appl. No. 18/343,373.
Prior Publication US 2025/0007760 A1, Jan. 2, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 17/20 (2015.01); H04L 25/08 (2006.01); H03F 3/45 (2006.01)
CPC H04L 25/085 (2013.01) [H04B 17/204 (2023.05); H03F 3/45475 (2013.01)] 20 Claims
OG exemplary drawing
 
20. A receiver circuit for a high-speed data communication interface, the receiver circuit comprising:
a differential data signal input including a positive signal input and a negative signal input;
a first termination resistor having a first terminal coupled to the positive signal input and a second terminal at a reference voltage node;
a second termination resistor having a first terminal coupled to the negative signal input and a second terminal coupled to the second terminal of the first termination resistor at the reference voltage node;
a difference amplifier having a first input terminal coupled to a reference voltage, a second input terminal coupled to the reference voltage node, and an output terminal to provide a noise measurement node; and
a reference resistor coupled to the output terminal of the difference amplifier and a second terminal coupled to the second terminal of the first termination resistor and to the second terminal of the second termination resistor;
wherein the receiver circuit is configured to provide at the noise measurement node a representation of common mode noise between the positive signal input and the negative signal input.