Adc output drift correction techniques
AssigneeAnalog Devices International Unlimited Company
InventorsMahesh Madhavan Kumbaranthodiyil, Kirubakaran Ramalingam
Life of this patent
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Abstract
Techniques are described that can be used to extract an offset and a gain of a signal chain, which can be used for digital correction of an analog-to-digital converter (ADC) output to help achieve a life time and temperature stable ADC output. For example, using various techniques, a value for a voltage reference VREF and a value for ground (GND) (or other reference voltage) can be converted, which can then be used to determine gain and offset, respectively, of the signal chain.
Claims20
A method of correcting a gain drift and an offset drift of a signal chain so as to achieve a temperature stable analog-to-digital converter (ADC) output signal of an ADC circuit, the method comprising:
- determining first and second digital codes representing corresponding first and second reference voltages;
- determining the gain drift and the offset drift of the ADC circuit using the first and second digital codes;
- and
- correcting the gain drift and the offset drift of the ADC circuit.
A circuit for correcting a gain drift and an offset drift of a signal chain so as to achieve a temperature stable analog-to-digital converter (ADC) output signal of an ADC circuit, the circuit comprising:
- the ADC circuit, configured to determine first and second digital codes representing corresponding first and second reference voltages;
- and
- a digital processing circuit coupled to the ADC circuit and configured to:
- determine the gain drift and the offset drift of the ADC circuit using the first and second digital codes;
- and
- correct the gain drift and the offset drift of the ADC circuit.
A circuit for correcting a gain drift and an offset drift of a signal chain so as to achieve a temperature stable analog-to-digital converter (ADC) output signal of an ADC circuit, the circuit comprising:
- means for determining first and second digital codes representing corresponding first and second reference voltages;
- and
- a digital processing circuit coupled to the ADC circuit and configured to:
- determine the gain drift and the offset drift of the ADC circuit using the first and second digital codes;
- and
- correct the gain drift and the offset drift of the ADC circuit.
Dependencies are inferred from the claim text.