Thin module system and method with skew reduction

Abstract

A flex circuit populated with integrated circuits on one or both sides and in one or more fields along the flex circuitry is wrapped about an edge of a supporting substrate. One side of the flex circuitry has a connective facility implemented in a preferred embodiment with edge connector contacts such as those that would allow the resulting module to be connected to an expansion socket. In a preferred embodiment, integrated circuits (preferably memory CSPs) and any accompanying circuitry or buffers are arranged on one or both sides of a flexible circuit. In some embodiments, one or more thermal sensors or other indicators are thermally coupled to the module substrate. In some embodiments that employ a metallic material substrate with extensions, the ICs of the module have exhibited reduced temperature variations when compared to like capacity DIMMs devised according to the well known planar strategy.

1 . A circuit module for reducing thermal variation between constituent CSPs, the module comprising: 
 (a) a thermally-conductive rigid substrate having first and second lateral sides, at least two extensions and an edge; and    (b) flex circuitry populated with a plurality of CSPs and exhibiting a connective facility the comprises plural contacts for insertion in an edge connector, the flex circuitry being wrapped about the edge of the thermally-conductive substrate.    
   
   
       2 . The circuit module of  claim 1  in which the plurality of CSPs are comprised of memory circuit CSPs.  
   
   
       3 . The circuit module of  claim 1  comprising an instantiation of at least one FB-DIMM circuit.  
   
   
       4 . The circuit module of  claim 1  comprising an instantiation of at least one registered DIMM circuit.  
   
   
       5 . The circuit module of  claim 1  further comprising a microprocessor.  
   
   
       6 . The circuit module of  claim 1  in which the first and second sides of the flex circuitry are populated with memory circuit CSPs.  
   
   
       7 . The circuit module of  claim 1  in which the thermally-conductive rigid substrate is comprised of aluminum.  
   
   
       8 . The circuit module of  claim 1  further comprising a sensor.  
   
   
       9 . The circuit module of  claim 8  in which the sensor is a thermal sensor that provides a signal related to a thermal condition of the module.  
   
   
       10 . The circuit module of  claim 8  in which the sensor provides a signal related to module capacity.  
   
   
       11 . The circuit module of  claim 1  inserted into an edge connector.  
   
   
       12 . The circuit module of  claim 11  in which the edge connector is connected a computer.  
   
   
       13 . A circuit module for reducing thermal variation between constituent CSPs, the module comprising: 
 (a) a thermally-conductive rigid substrate having first and second lateral sides, at least two extensions and an edge; and    (b) flex circuitry comprising a first flex circuit populated with a plurality of CSPs and having plural contacts for insertion in an edge connector and a second flex circuit populated with a plurality of CSPs.    
   
   
       14 . The circuit module of  claim 13  in which each of the first and second flex circuits have first and second sides each of which sides are populated with CSPs.  
   
   
       13 . The circuit module of  claim 13  comprising an instantiation of a FB-DIMM.  
   
   
       14 . The circuit module of  claim 13  comprising an instantiation of a registered DIMM.  
   
   
       15 . The circuit module of  claim 13  further comprising a microprocessor.  
   
   
       16 . The circuit module of  claim 13  further comprising a sensor.  
   
   
       17 . The circuit module of  claim 16  in which the sensor provides a signal related a thermal condition of the module.  
   
   
       18 . The circuit module of  claim 16  in which the sensor generates a signal related to module capacity.  
   
   
       19 . A circuit module comprising: 
 a thermally-conductive rigid substrate having first and second lateral sides and an edge;    flexible circuitry populated with plural CSPs and at least one sensor, the flexible circuitry being wrapped about the edge of the thermally-conductive rigid substrate.    
   
   
       20 . The circuit module of  claim 19  in which the at least one sensor is a sensor that provides a signal related to a thermal condition of the module.  
   
   
       21 . The circuit module of  claim 20  in which the at least one sensor is a sensor that provides a signal related to module capacity.  
   
   
       22 . The circuit module of  claim 19  comprising at least one FB-DIMM instantiation.  
   
   
       23 . The circuit module of  claim 19  in which at least one of the first and second lateral sides of the thermally-conductive rigid substrate has a cutout area into which is disposed a CSP.  
   
   
       24 . A circuit module comprising: 
 a flex circuit having a first side and a second side, the first side exhibiting a connective facility disposed between first and second pluralities of first side memory CSPs disposed along the first side, the second side exhibiting first and second pluralities of second side CSPs disposed along the second side;    an aluminum substrate having first and second lateral sides and at least one extension opposite an edge of the aluminum substrate, the flex circuit being disposed about the edge of the aluminum substrate to dispose the connective facility more proximal to the edge of the substrate than the at least one extension.    
   
   
       25 . The circuit module of  claim 24  in which the connective facility is a plurality of edge connector contacts.