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With high operation frequencies, the effects of interconnects must be accounted for in the design of digital circuits. Interconnects can be modeled with RLC circuits, which are typically very large. Special order-reduction algorithms, which produce a smaller frequency-domain model of the interconnect , have been developed in the literature. Linking between(More)
This paper presents a robust partitioning-based model-order reduction (MOR) method, PartMOR, suitable for reduction of very large RLC circuits or RLC-circuit parts of a non-RLC circuit. The MOR is carried out on a partitioned circuit, which enables the use of low-order moments and macromodels of few elements, while still preserving good accuracy for the(More)
This paper proposes a new second-order Model Order Reduction (MOR) method suitable for reducing very large sized RC circuits or RC circuit parts of a non-RC circuit. The MOR is carried out on a partitioned circuit, which enables the use of low-order moments and macromodels of few elements. It is shown that the use of the second-order MOR method in(More)
RF circuits make great demands on simulators, especially when a circuit contains excitations at many different frequencies and the circuit is strongly nonlinear. In recent years, many new methods have been presented to analyze these kinds of circuits. One example, MSSTD analysis, has been implemented in the APLAC circuit simulator. It solves the steady(More)
Highly nonlinear circuits are very demanding to simulate, especially when they are excited with two separate frequencies as is the case with, e.g., RF circuits and SC filters. Frequency-domain methods, e.g. harmonic balance (HB), that can handle two-tone signals are more suitable for sine wave excitations and weakly nonlinear circuits. Multivariate(More)
This master's thesis deals with the modeling of digital components in the APLAC circuit simulator. The digital component models are created in the mixed-mode analysis environment already implemented in APLAC. At first, the structure and logic operation of the modeled combinational and sequential digital components are reviewed. Also, the most important(More)
The linearized harmonic-balance equations are typically solved using an iterative solver, like GMRES. The efficiency of the iterative solver depends heavily on the preconditioner used. The paper presents three block preconditioners for harmonic balance Jacobians. The preconditioner can be chosen for each block separately to be either a frequency-domain or(More)