A low-power, area-efficient digital filter for decimation and interpolation

The area and power consumption of oversampled data converters are governed largely by the associated digital decimation and interpolation filters. This paper presents a low-power, area-efficient, mask-programmable digital filter for decimation and interpolation in digital-audio applications. Several architectural and implementation features reduce the complexity of the filter and allow its realization in a die area of only 3670 mils² (2.37 mm²) in a 1-μm CMOS technology. The use of simple multiplier-free arithmetic logic and a new memory addressing scheme for multi rate digital filters results in a power consumption of only 18.8 mW from a 5-V supply and 6.5 mW from a 3-V supply. The memory addressing scheme and the programmable functionality of the filter are general enough to implement a wide class of FIR and IIR single-rate and multi-rate digital filters