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We compare circuit and architecture choices in the global interconnect of an FPGA in order to find the minimum energy design for low voltage operation. We look at switch box topology, number of repeaters, receiver circuit topology, and dynamic voltage selection, all with the intent of minimizing energy consumption. The results show that using a pass gate switchbox topology with repeaters in the interconnect and a custom receiver lowers delay by up to 63% and energy by up to 87% from the standard FPGA circuit choices. This work also identifies the optimal VDD choices to maximize performance under energy constraints or vice versa.