US 12,353,350 B2
Radio frequency interference common mode injection in a C-PHY receiver
Panchami Devashya Shivarama, San Diego, CA (US); Ying Duan, San Diego, CA (US); Qinqing Cao, San Diego, CA (US); Seuk Son, San Diego, CA (US); Mansoor Basha Shaik, Bangalore (IN); and Abhay Dixit, San Diego, CA (US)
Assigned to QUALCOMM INCORPORATED, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 6, 2023, as Appl. No. 18/462,107.
Prior Publication US 2025/0077462 A1, Mar. 6, 2025
Int. Cl. G06F 13/42 (2006.01); G06F 13/40 (2006.01)
CPC G06F 13/4282 (2013.01) [G06F 13/4068 (2013.01)] 27 Claims
OG exemplary drawing
 
1. An input buffer comprising:
a first input transistor having a source that is coupled to a first voltage rail through a first current source and a gate coupled to a first wire of a multi-wire serial bus;
a first injection circuit comprising:
three or more resistors configured to couple the wires of the multi-wire serial bus to a common node of the first injection circuit; and
a capacitor configured to couple the common node of the first injection circuit to the source of the first input transistor;
a second input transistor having a source that is coupled to the first voltage rail through a second current source and a gate coupled to a second wire of the multi-wire serial bus; and
a second injection circuit comprising:
three or more resistors configured to couple the wires of the multi-wire serial bus to a common node of the second injection circuit; and
a capacitor configured to couple the common node of the second injection circuit to the source of the second input transistor;
wherein the input buffer is provided in a first differential receiver circuit, and wherein each combination of two wires in a three-wire serial bus is coupled to one of three differential receiver circuits.