Demonstration of 17 GHz operation of M-code generator based on SFQ with resettable latch

We have experimentally demonstrated high-speed operation of a maximum code length (M-code) generator using the on-chip-testing system. M-code generator was designed by using Single Flux Quantum with Resettable Latch (SFQ-RL) proposed by us, and fabricated by the NEC standard process. The circuit operates up to 17 GHz correctly, while the bias margin decreases at higher frequencies due to the timing-related errors. This circuit based on SFQ-RL has an advantage that the initialization of the whole circuit can be realized easily. We have also confirmed the “flush” operation that the internal state is initialized simultaneously by one SFQ pulse in SFQ-RL