Measurement system with correction for temperature-based converter feedback error

A method of reducing error due to sensor temperature variation in an integrating analog-to-digital converter (ADC) system, the method comprising:

• first converting an output of the sensor to provide first digital output values;
• second converting residues of the first converting to provide second digital output values;
• measuring the sensor temperature;
• differentiating a sequence of the second digital output values;
• applying a temperature correction generated from a result of measuring the sensor temperature to a result of the differentiating;
• second integrating the temperature-corrected result of the applying the temperature correction;
• and
• adding the first digital output values to results of the second integrating to provide the output of the analog-to-digital converter system.

A system, comprising:

• a first sensor for generating an electrical output;
• an integrating analog-to-digital converter (ADC) having a first converter circuit that first converts the output of the sensor to provide first digital output values, a second converter circuit that converts residues of the first converter to provide second digital output values, a combiner that combines the first digital output values with the second digital output values to provide an output of the analog-to-digital converter, and a control circuit that controls conversions of the first converter circuit and the second converter circuit;
• and
• a second sensor for providing an indication of a temperature of the first sensor, and wherein the control circuit is coupled to the second sensor and adjusts a second rate of operation of the second converter independent of a first rate of operation of the first converter in conformity with the indication of the temperature of the first sensor.

A system, comprising:

• a first sensor for generating an electrical output;
• a second sensor for providing an indication of the temperature of the first sensor,
• an integrating analog-to-digital converter (ADC) having a first converter circuit that first converts the output of the first sensor to provide first digital output values, a second converter circuit that converts residues of the first converter to second digital output values, a combiner that combines the first digital output values with the second digital output values to provide an output of the analog-to-digital converter, and a control circuit that controls conversions of the first converter circuit and the second converter circuit;
• a differentiator that differentiates a sequence of the second digital output values;
• a temperature corrector that applies a temperature correction in accordance with the indication of the temperature of the first sensor to an output of the differentiator;
• an integrator that integrates a temperature-corrected output of the temperature corrector;
• and
• a combiner that adds the first digital output values to an output of the integrator to provide the output of the integrating analog-to-digital converter.