Patent ID: 8780561

Claim:
A method of forming a semiconductor circuit, the method comprising; providing first and second semiconductor devices, each respective first and second device having a respective first and second opposing surfaces, wherein the first and second semiconductor devices are configured to be fixedly attached to a top surface of a circuit board along their respective first surfaces, such that the respective second surfaces of the first and second semiconductor devices are each oriented to be disposed above the top surface of the circuit board; coupling a plurality of electrical connections disposed on the first surface of at least one of the first and second devices to a respective plurality of mating circuit board electrical connections disposed on the top surface of the circuit board, via a respective plurality of solder balls, the respective plurality of solder balls having a respective overall height; coupling the respective second opposing surfaces of each of the first and second semiconductor devices to first and second respective portions of a sacrificial thermal spreader material, the first and second respective portions each comprising a respective material that is thermally conductive, wherein each respective first and second portion of the sacrificial thermal spreader material comprises top and bottom surfaces, wherein each respective bottom surface is coupled to the respective second surface of the respective semiconductor device; and planarizing at least one of the respective top surfaces of the first and second portions of the sacrificial thermal spreader material, after the first and second portions have been coupled to the respective first and second semiconductor devices, wherein the planarizing is configured to substantially equalize a respective first total height of the first semiconductor device to a respective second total height of the second semiconductor device, while keeping the respective first and second surfaces of each of the first and second semiconductor devices disposed above the top surface of the circuit board; wherein the first total height is measured, after planarizing, from the top surface of the circuit board to the top surface of the first portion of the sacrificial thermal spreader material, and the second total height is measured, after planarizing, from the top surface of the circuit board to the top surface of the second portion of the sacrificial thermal spreader material.