BGA Via Pattern Diagonal Orientation for Crosstalk Reduction
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Solution Overview
Problem
Existing methods to minimize signal cross-talk between differential pairs in integrated circuits, such as using power or ground conductors, consume valuable area on printed circuit boards and are not the most efficient use of the ball grid array (BGA) pattern.
Innovation Solution
A BGA and PCB via pattern where transmit and receive differential signal pairs are arranged in a diagonal orientation with each node of the receive pair equidistant from each node of the transmit pair, reducing differential mode crosstalk and allowing for more efficient use of the BGA layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power or ground conductors are used to separate differential pairs on the BGA layout, then signal isolation and crosstalk minimization are improved, but valuable area on the PCB is consumed and BGA pattern efficiency deteriorates
Solution Approach 1:
The patent applies asymmetry by positioning the receive differential pair diagonally relative to the transmit differential pair, rather than using symmetric adjacent positioning. This diagonal arrangement with equidistant nodes creates asymmetric spacing that naturally reduces crosstalk while maintaining compact layout, eliminating the need for additional ground conductors between pairs.
Solution Approach 2:
The patent transitions from traditional linear or orthogonal arrangements of differential pairs to a diagonal configuration across the BGA substrate. By utilizing the diagonal dimension and establishing equidistant nodal relationships, the design achieves superior signal isolation without requiring additional vertical space or ground conductor layers.
2Object-affected harmful factors
If power or ground conductors are used to separate differential pairs on the BGA layout, then signal isolation and crosstalk minimization are improved, but BGA pattern efficiency deteriorates
Solution Approach 1:
The diagonal positioning of receive differential pair nodes relative to transmit differential pair nodes creates an asymmetric layout that maximizes the utilization of available BGA positions. This asymmetric arrangement achieves optimal signal isolation while maintaining high packing efficiency, allowing more functional elements to be placed within the same BGA footprint.
Solution Approach 2:
By utilizing diagonal positioning across the BGA substrate rather than traditional orthogonal arrangements, the patent enables more efficient use of the two-dimensional BGA pattern. The equidistant nodal relationship in the diagonal configuration allows for denser packing of signal pairs while maintaining electrical isolation.
3Area of stationary object
If traditional BGA layout methods are used, then area efficiency is maintained, but signal cross-talk between differential pairs increases
Solution Approach 1:
The patent employs asymmetric diagonal positioning of differential pair nodes, where each receive pair node is equidistant from its corresponding transmit pair nodes. This asymmetric geometric relationship creates natural signal isolation through optimized spacing, reducing crosstalk without requiring additional area or ground conductors between the pairs.
Solution Approach 2:
The invention utilizes the diagonal dimension of the BGA substrate to arrange differential pairs, transitioning from traditional orthogonal layouts. This diagonal arrangement with equidistant nodal relationships achieves superior electromagnetic isolation while maintaining compact area utilization, effectively addressing crosstalk issues without sacrificing space efficiency.
Data Source
AI summary
A ball grid array (BGA) and via pattern includes a printed circuit board (PCB) having a surface on which a plurality of regions are formed and a transmit (TX) and receive (RX) cluster comprising a transmit differential signal pair and a receive differential signal pair formed using at least a portion of the plurality of regions on the surface of the PCB, the transmit differential signal pair and the receive differential signal pair comprising nodes arranged in a diagonal orientation in which each node of the receive differential signal pair is equidistant from each node of the transmit differential signal pair.