Abstract
We have designed a 1-bit rapid single flux quantum microprocessor based on simple architecture. The target local clock frequency is 10 GHz. The microprocessor consists of a 1-bit ALU, two 8-bit resistors, a program counter and a state controller. In order to reduce the complexity of the system and increase the clock frequency, a width of the data bus is reduced to 1-bit and the distributed local clock architecture is employed. Though the instruction set comprises only six operations, it includes all the basic operation required in general purpose computing. The circuit design of the microprocessor has carried out by using a binary decision diagram and a cell-based design methodology with the aid of top-down CAD environment. One of the important components of the microprocessor, a 1-bit ALU, which contains 730 Josephson junctions, has been implemented using the 1 kA/cm 2 Nb process and its successful operation is confirmed at low speed.
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