TWISTED DIFFERENTIAL COMPENSATION FOR ROUTING HIGH-SPEED SIGNALS NEAR POWER DELIVERY INDUCTORS AND SYSTEM MINIATURIZATION

• Main Authors: BALAKRISHNAN, Ranjul, WANG, Long, HALL, Stephen H
• Format: Patent
• Language: English
• Published: 16.12.2021
• Subjects: CALCULATING; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PHYSICS; PRINTED CIRCUITS

Apparatus and methods employing twisted differential compensation for routing high-speed signals near power delivery inductors. Traces used for a high-speed differential signal including a P trace and an N trace are routed through one or more layers in a multi-layer printed circuit board (PCB) substrate and employ a twisted portion proximate to the centerline of an inductor under which portions of the P and N traces are swapped horizontally in a layer parallel to the top plane and/or are swapped vertically by swapping layers. The signal paths are routed such that a level of noise inductively coupled into the P trace and the N trace from the inductor is approximately equally. Stripline structures may be used for signals that are routed under an inductor, while stripline and microstrip structures may be used for signals routed adjacent to an inductor.