Analog digital converter

Details Analog digital converter Analog digital converter

1993-11-15

1995-11-28

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, H03M 134

Patent

active

054712106

ABSTRACT:
The invention concerns precision analogue-digital converters. For the fine conversion, supplying the low order bits (B0 to Bk) for an analogue voltage Vin to be converted, three ordinary differential amplifiers (ADA, ADB, ADC) are used connected to three voltage references VR(i-1), VR(i), VR(i+1). These three amplifiers supply differential output voltages (VAa, VAb, VBa, VBb, VCa, VCb) that vary as a function of Vin according to normal transfer functions for differential amplifiers. Intersection points of these various transfer curves are detected in interpolation circuits (firstly CIT1, then CIT2, etc). These intersection points are used as intermediate voltage references between the main references. Comparators (CMP0 . . . CMPk), placed at the output of interpolation circuits supply bits (B0 to Bk) indicating the value of Vin with respect to each of these intermediate references.

REFERENCES:
patent: 4058806 (1977-11-01), Nadler
patent: 4297679 (1981-10-01), Arbel et al.
patent: 5126742 (1992-06-01), Schidt et al.
patent: 5151700 (1992-09-01), Matsuzawa et al.

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