Precision analog-to-digital converter with low-resolution and hi

Details Precision analog-to-digital converter with low-resolution and hi Precision analog-to-digital converter with low-resolution and hi

1994-05-12

1995-08-29

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

324 99D, 324115, 341131, 364487, G01R 1706

Patent

active

054463718

ABSTRACT:
An analog-to-digital converter utilizes low-resolution and high-resolution conversion paths for precision voltage measurements. A first conversion made using a comparatively low resolution ADC is used to predict the reference voltage to one input of a null detector that receives the input voltage on another input, and effectively magnifies the voltage difference between its inputs. In a preferred embodiment, the duty cycle of a pulse-width modulator is adjusted to precisely adjust the reference voltage to provide a nulled (or near null) reading from the null detector. A low resolution ADC then converts the voltage from the null detector, which when added to the reference voltage, yields a final reading with 18-bit to 22-bit accuracy. The preferred embodiment is implemented to read the output from a pressure transducer and employs a binary search technique to rapidly adjust the duty cycle of the pulse-width modulator. The system utilizes a single ADC which is multiplexed between the low-resolution, high-speed reading and high-resolution, low-speed reading of the fully settled output of the null detector.

REFERENCES:
patent: 4868910 (1989-09-01), Maulding
patent: 5155431 (1992-10-01), Holcomb

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