Reduced power FIR filter

Details Reduced power FIR filter Reduced power FIR filter

1996-11-18

1999-07-13

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from differential codes

341143, 364707, H03M 300

Patent

active

059232730

ABSTRACT:
A reduced power FIR filter may be utilized as the digital decimation filter for a delta sigma ADC. The FIR filter utilizes a serial bit stream which is part of the control path of the filter. Thus, operations of the circuitry which comprises the filter may be controlled depending upon the data presented at the output of the delta sigma modulator. In particular, filter operations may be enabled only for a given digital state, for example, a digital 1 state. Thus, the filter operations may be enabled only for typically half of the bits from the serial bit stream and the power usage of the digital filter is significantly reduced.

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