Back-to-back package accomplishing short signal path lengths
AssigneeXerox Corporation
InventorHARRY J. MCINTYRE
Life of this patent
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Abstract
This is a PCBA that can be used in any system where one component or package is connected to another component or package. This invention provides a very short connector or signal path that avoids the necessity of a signal trace termination in the PCB. The PCB has on its upper surface a first component or package and on its lower surface a second component or package in vertical physical and signal alignment with the first component or package. The first component or package has a BGA on its bottom surface and the second component has a BGA on its top surface, both of these BGAs are in electrical contact with each other. Because of the short signal trace provided, the PCB provides signal transitions as fast as 200 pS.
Claims18
A high speed electrostatic marking system comprising:
- conventional xerographic stations, at least one sensor and at least one system controller,
- said system controller comprising a printed circuit board PCBA,
- said circuit board comprising a PCB substrate having an upper surface and a lower surface,
- at least a first component or package positioned on said upper surface, and at least a second component or package positioned on said lower surface,
- said first component or package having a ball grid array (BGA) positioned on its bottom surface, and said second component or package having a ball grid array (BGA) positioned on its top surface,
- a connector or signal trace electrically connecting said first and second components.
A printed circuit board assembly comprising a PCB substrate having an upper surface and a lower surface,
- at least a first component or package positioned on said upper surface, and at least a second component or package positioned on said lower surface,
- said first component or package having a ball grid array BGA positioned on its bottom surface, and said second component or package having a ball grid array BGA positioned on its top surface,
- a connector or signal trace, electrically connecting said first and second components.
Dependencies are inferred from the claim text.