Passive multiplexing using sparse arrays

摘要

A multiplexed array of resistors including a plurality of address leads and a plurality of ground leads which cooperatively define a matrix of nodes, each node defining a possible location in the matrix for a resistor heater interconnecting one address lead and one ground lead. Resistor heaters are located in the array at only a portion of the nodes. The locations of the resistor heaters are selected to limit the conductance of alternate current paths around the resistor heater when addressed. The resistor heaters are preferably formed at nodes selected so that no two address leads are interconnected through resistor heaters to more than one common ground lead. Preferably, each alternate current path includes at least four non-addressed resistors in series.