Analog Circuit Design

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Applications for a switched-capacitor instrumentation building block

Jim Williams

CMOS analog IC design is largely based on manipulation of charge. Switches and capacitors are the elements used to control and distribute the charge. Monolithic filters, data converters and voltage converters rely on the excellent characteristics of IC CMOS switches. Because of the importance of switches in their circuits, CMOS designers have developed techniques to minimize switch induced errors, particularly those associated with stray capacitance and switch timing. Until now, these techniques have been used only in the internal construction of monolithic devices. A new device, the LTC®1043, makes these switches available for board-level use. Multi-pole switching ...