Resonant tunnelling diode based QMOS edge triggered flip-flop design

Resonant tunnelling diode (RTD) is well known as an ultra-fast device due to small intrinsic capacitance, large drive current was well as the high switching speed. Pair of RTDs has self-latching property, which makes RTD a very promising candidate for nano-pipelining circuit design. The most pervasive used RTD-based sequential logic is MOBILE. However, MOBILE is a return-to-zero mode circuit, which makes it difficult to be used in some specific applications. In this paper, we proposed three quantum MOS (QMOS) flip-flop designs. Our designs explore the advantage of MOBILE while keeping the output to a holding stage instead of return-to-zero. The circuit topologies and circuit operations are described and discussed. The performance of these circuits is evaluated by using HSPICE. Then the final results are compared with each other.