Design centering methods for yield optimization of cryoelectronic circuits

Abstract

We present the results of comparison of different design centering methods, e.g. simplicial approximation method and centers-of-gravity method.The effectiveness of the proposed yield optimization strategies is demonstrated by application to various RSFQ circuits and analytical test functions. A SPICEtype program which includes the possibilities of analog behavior modeling and transient noise simulation was used €or circuit simulation. Based on these methods, an interactive yield optimization framework for cryoelectronic circuits was developed and tested.

Bit error probabilities in high temperature superconductor logic

“…Because the parameter space of our circuits tends to be large, 9 we use the centers of gravity method introduced by Soin and Spence. 10 Our implementation optimizes for yield in the presence of noise using our stochastic extension 5 of Berkeley's JSIM circuit simulator.…”

Tools for the computer-aided design of multigigahertz superconducting digital circuits

“…In COWBOY/PSCAN, XOPT, and ABAK, a special HDL is used to describe the correct operation of the circuit. Various languages are used for this purpose: PSCAN uses a customdesigned notation called SFQHDL [54], XOPT employs a subset of VHDL called HDL-A [50], and ABAK makes use of the general purpose object-oriented programming language C++ [51]. The exact rules for describing correct circuit behavior vary from notation to notation.…”

“…COWBOY is currently an integral part of the PSCAN simulation environment [23], while rtry is a stand-alone tool using JSim for simulation. The second group includes MALT developed at the University of Rochester [17], [47], [48], XOPT developed at the University of Ilmenau (Germany) [49], [50], and ABAK [51] developed at the University of Karlsruhe (Germany). All of these tools use yield as the figure of merit being optimized.…”

Minimization of noise-induced bit error rate in a high Tc superconducting dc/single flux quantum converter

“…In our case, there is no previous knowl- edge about the future operation modes and equal weighting coefficients ␣ϭ␤ϭ␥ϭ1/3 are used. In the standard procedure of circuit design, the values of its constitutive elements are derived from a yield-driven optimization 14 which in our case led to L 1 ϭ3.8 pH and I b ϭ180 A, respectively. The switching error rates of these parameters can be obtained from Eq.…”