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T –FLIPFLOP

Platform : vlsi

IEEE Projects Years : 1991

This paper appears in: Applied Superconductivity, IEEE Transactions on Issue Date: Jun 1999 AIM : IMPLEMENTATION OF HIGH SPEEDT-FLIP FLOP IN VHDL ABSTRACT Rapid Single Flux Quantum (RSFQ) T-flip flops (TFFs) operating up to 770 GHz have been demonstrated at 4.2 K. The devices, consisting of either resistively shunted or unshunted Josephson junctions, are fabricated using a planarized Nb/AlOx/Nb trilayer process. Electron beam lithography is used to pattern all levels with a minimum junction area less than 0.1 μm2. Critical current densities of 0.5 mA/μm2 and 2.5 mA/μm2 are used for the shunted (tested at 1.8 K) and unshunted devices (tested at 4.2 K) respectively. The input and output frequencies of the TFFs are obtained from the input and output voltages by the Josephson relation. The output voltage is exactly half of the input voltage when the divide-by-two operation is correct. LEARNING OBJECTIVE: To understand about high speed T-flip flop in VHDL INPUT: Data / information about high speed T-flip flop in VHDL OUTPUT : Simulated output of high speed T-flip flop in VHDL APPLICATIONS: Very high speed integrated circuit hardware description language based design, VLSI Design SOSFTWARE TOOL USED: XLINX8.1I

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