SUMMARYA systematic method for the simulation of LC ladders and unit-element filters by means of switched capacitor (SC) circuits is proposed. The method is based on the use of wave equivalents of various two-port subnetworks which are now realized by the same type of SC symmetric subcircuits. These subcircuits serve as the structural unit-blocks for realizing high-order circuits. Parasitic-free circuits of practical interest can be developed. Examples of high-order circuits are given. This wave method is simple in its concept and also in the circuit design. Through the alternative solutions which are described, the flexiblity of the method is demonstrated.
SUMMARYA direct z-domain simulation of LC ladder and unit-element filters by means of wave SC circuits is presented. The development of a wave SC circuit is achieved by interconnecting a limited number of basic SC building blocks. The derived circuits are fully parasitic-free, symmetric and can be optimally designed for dynamic range maximization and capacitance area minimization. The number of operational amplifiers in the simulated unit-element filters is essentially low in comparison to earlier presented parasitic-insensitive wave SC filters and to leap-frog-type SC filters. Four-and two-phase multiplexed simulated LCR filters can be developed. Bilinear s--z transformation applies for all the circuits; thus the design is exact and there is no requirement for a high clock frequency. Filters with transmission zeros can be developed. The simulated responses of various types of filters are in good agreement with the theory. Detailed examples of different designs are given.
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