Integrating A/D converter with means for reducing rollover error

Details Integrating A/D converter with means for reducing rollover error Integrating A/D converter with means for reducing rollover error

1991-08-06

1993-02-02

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Bipolar

341167, 341118, H03M 182

Patent

active

051841282

ABSTRACT:
An improved integrating type A/D converter has a set of analog switches and a control logic unit for selectively connecting a pair of input terminals for an unknown analog input voltage signal with a pair of input leads across a buffer and integrator in order to apply, first in an integrate phase, the analog input signal in a polarity direction that causes the integrator to ramp up in the same direction regardless of the polarity of the analog input signal, and then in a deintegrate phase, reference voltages are applied across the input leads in a fixed direction opposite to the applied input voltage such that a zero crossing signal is output by the comparator. The ramping-up and ramping-down of the integrator in the same direction eliminates rollover error in the A/D reading of inputs of different polarities but of the same magnitude. The invention is particularly useful for monolithic A/D converters using BiMOS technology. The preferred embodiment performs a subdivided measurement of a number of integrate/deintegrate phases of the analog input signal, and a second, residual error measurement using a pair of storage capacitors with capacitances in a predetermined multiplier ratio.

REFERENCES:
patent: 3500384 (1970-03-01), Naydan et al.
patent: 3737893 (1973-06-01), Belet et al.
patent: 4074257 (1978-02-01), Henry
patent: 4082998 (1978-04-01), Marriott
patent: 4568913 (1986-02-01), Evans
patent: 4656459 (1987-04-01), Thurber, Jr.
patent: 4857933 (1989-08-01), Knight

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