Abstract

A building block approach to the design and simulation of complex current-memory circuits is described. Sampled-data techniques are used to simulate the operation of networks containing a great number of cells. The main building block is the current-memory cell itself, which has been carefully modeled including charge injection and noise. The proposed model has been compared to SPICE simulations on several small examples, and excellent agreement is obtained. Simulation of complex circuits is orders of magnitude faster than a full time-domain simulation with SPICE. The usefulness of the approach is demonstrated through the design and simulation of a current-memory based second order Σ — Δ modulator. The complete characterization of the signal-to-noise and distortion ratio can be achieved in about 4 hours of CPU time on an advanced workstation.

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