Patent ID: 7026708

Claim:
A high-density circuit module comprising: a first flex circuit having first and second conductive layers between which conductive layers is an intermediate layer, the first and second conductive layers being interior to first and second outer layers of the first flex circuit, the second conductive layer having upper and lower flex contacts, the upper flex contacts being accessible through second CSP windows through the second outer layer and the lower flex contacts being accessible through first CSP windows through the first outer layer, the first conductive layer and the intermediate layer, the lower flex contacts being further accessible through module contact windows through the second outer layer; a second flex circuit having first and second conductive layers between which conductive layers is an intermediate layer, the first and second conductive layers being interior to first and second outer layers of the second flex circuit, the second conductive layer having upper and lower flex contacts, the upper flex contacts being accessible through second CSP windows through the second outer layer and the lower flex contacts being accessible through first CSP windows through the first outer layer and the first conductive layer and the intermediate layer, the lower flex contacts being further accessible through module contact windows through the second outer layer; a first CSP having first and second lateral sides and upper and lower major surfaces with contacts along the lower major surface, the contacts of the first CSP extending no further than 7 mils above the lower major surface of the first CSP and being connected to the lower flex contacts of the first and second flex circuits; a second CSP having first and second lateral sides and upper and lower major surfaces with contacts along the lower major surface, the contacts of the second CSP extending no further than 7 mils above the lower major surface of the second CSP and being connected to the upper flex contacts of the first and second flex circuits; a form standard disposed above the upper major surface of the first CSP; and a set of module contacts connected to the lower flex contacts of the first and second flex circuits.