Method and apparatus for self-tracking multiple analog to digita

Details Method and apparatus for self-tracking multiple analog to digita Method and apparatus for self-tracking multiple analog to digita

1992-04-24

1993-07-27

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 341139, H03M 118

Patent

active

052313980

ABSTRACT:
A method and apparatus for non-linear quantization of a signal that utilizes two or more lowresolution analog to digital converters (ADCs) to allow selective increased quantization levels at desired portions of a signal. This is accomplished by using a primary ADC which provides digital output signals over a first predetermined range, and at least one secondary ADC which provides digital output signals over a smaller predetermined range for the same input values. Accordingly, any secondary ADCs have a smaller quantization step size than the first, and are utilized when finer resolution is desired. The ADCs are kept in alignment by periodically comparing the digital values produced by the ADCs for a known input analog value.

REFERENCES:
patent: 4069479 (1978-01-01), Carpenter et al.
patent: 4733217 (1988-03-01), Dingwall
patent: 4862171 (1989-08-01), Evans
"Analog to Digital Conversion Handbook", Analog Devices, Inc. 1986, pp. 426-427.

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