MANY TWO-CHIP SETS for CODEC and filters have been developed recently. There are, however, strong demands for even further reduction in power dissipation, production cost and package size in CODEC LSIs to realize economical and flexible digital telephone systems. This report will describe a single-chip CODEC with on-chip filters involving CMOS technology.A CODEC block diagram is shown in Figure 1. Two independent companding D/A converters, using capacitor array and resistor string (C-R companding D/A), are ut…
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