Cascaded recursive transversal filter for sigma-delta modulators

Details Cascaded recursive transversal filter for sigma-delta modulators Cascaded recursive transversal filter for sigma-delta modulators

1996-01-29

1997-09-30

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

H03M 300

Patent

active

056730446

ABSTRACT:
The loop filter of a sigma-delta analog-to-digital converter (ADC) includes a multistage loop filter coupled to the output port of an input summer stage, for receiving difference signals therefrom. The loop filter includes a plurality of cascaded stages. All but one of the cascaded stages includes first and second cascaded half-stages, and that one of the stages includes at least one half-stage. The last one of the cascaded half-stages in the loop filter is coupled to the input port of an ADC stage for coupling loop-filtered difference signals or resonated signals thereto. The ADC stage produces the desired output digital signals. A DAC is coupled to the output of the ADC stage, for generating an analog replica of the desired digital output signals, and for coupling the replica to the input summer stage for aiding in generating the difference signals.

REFERENCES:
patent: 5392042 (1995-02-01), Pellon
patent: 5442353 (1995-08-01), Jackson

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