SCORE-computer analysis of switched capacitor networks containing resistors

The authors present an exact analysis method for the computer analysis of an extended class of multiphase switched capacitor circuits. Each phase, defined by a given setting of the periodically operated ideal switches represents a linear, time-invariant circuit containing ideal op-amps, capacitors and, optionally, resistors. The analysis method uses a common formulation for both ideal and lossy SC circuits. The method is based on the state-variable approach and the Laplace transform, and involves generating the state equation matrices, and eventually the transfer functions of the SC circuit. It has been implemented in the user-oriented package SCORE (for Switches, Capacitors, Op-amps, REsistors). The program features a free-format input circuit description language, including a hierarchical subcircuit facility, and graphical presentation of the transfer functions. A BASIC listing is given