Analog-to-digital conversion apparatus

Details Analog-to-digital conversion apparatus Analog-to-digital conversion apparatus

1997-09-16

2000-03-07

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, H03M 300

Patent

active

060346299

ABSTRACT:
An analog-to-digital (A/D) conversion apparatus using a delta-sigma method performs a magnitude control operation and a filtering operation with respect to a differential signal in a conventional A/D conversion apparatus. The A/D conversion apparatus includes a multiplier for multiplying a differential signal output from a differential circuit, a filter for filtering the differential signal and outputting a filtered data signal, and an adder for adding the signals output from the multiplier and the filter and supplying the added result to a quantizer. The factor used in the multiplier is selected so that the quantization noise generated is smaller than the quantization noise generated in the conventional A/D conversion apparatus. Thus, the A/D conversion apparatus provides a wider bandwidth than the conventional A/D conversion apparatus, since it generates relatively smaller quantization noise with respect to the entire passband. As a result, the A/D conversion apparatus provides good performance appropriate for next-generation audio equipment requiring a higher signal-to-noise ratio. Also, since the A/D conversion apparatus can be realized by modifying the conventional A/D conversion apparatus hardware only slightly, an A/D conversion apparatus having much better performance can be manufactured using substantially the same production process and cost.

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