Method and apparatus for digital calibration of an analog-to-digital converter
First Claim
1. An apparatus for calibrating an analog-to-digital (A/D) conversion system having an N-bit resolution, the apparatus comprising:
- an analog-to-digital converter (ADC) configured to generate an output having N most significant bits (MSBs) and M least significant bits (LSBs), where N and M are integers greater than zero;
an offset calibration circuit coupled to the ADC, the offset calibration circuit being configured to determine an offset in the ADC and compensate the output of the ADC using the offset to provide an N+M bit offset corrected output; and
a gain calibration circuit coupled to the offset calibration circuit, the gain calibration circuit being configured to determine a gain correction factor for the ADC, and compensate the N+M bit offset corrected output using the gain correction factor to provide an N bit offset and gain corrected output.
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Accused Products
Abstract
Method and apparatus for digital calibration of an analog-to-digital converter (ADC). One example relates to calibrating an analog-to-digital (A/D) conversion system having an N-bit resolution. The A/D conversion system includes an ADC that generates an output having N most significant bits (MSBs) and M least significant bits (LSBs) (i.e., an N+M bit resolution). An offset calibration circuit is configured to determine an offset in the ADC and to compensate the N+M bit output using the offset to provide an N+M bit offset corrected output. A gain calibration circuit is configured to determine a gain correction factor for the ADC and to compensate the N+M bit offset corrected output using the gain correction factor to provide an N bit offset and gain corrected output.
28 Citations
20 Claims
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1. An apparatus for calibrating an analog-to-digital (A/D) conversion system having an N-bit resolution, the apparatus comprising:
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an analog-to-digital converter (ADC) configured to generate an output having N most significant bits (MSBs) and M least significant bits (LSBs), where N and M are integers greater than zero; an offset calibration circuit coupled to the ADC, the offset calibration circuit being configured to determine an offset in the ADC and compensate the output of the ADC using the offset to provide an N+M bit offset corrected output; and a gain calibration circuit coupled to the offset calibration circuit, the gain calibration circuit being configured to determine a gain correction factor for the ADC, and compensate the N+M bit offset corrected output using the gain correction factor to provide an N bit offset and gain corrected output. - View Dependent Claims (2, 3, 4, 5)
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6. An analog-to-digital (A/D) conversion system having an N-bit resolution, the conversion system comprising:
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an analog-to-digital converter (ADC) having an analog input and an output having N most significant bits (MSBs) and M least significant bits (LSBs), where N and M are integers greater than zero; an offset calibration circuit having an input, a control input, and an output, the input of the offset calibration circuit being coupled to the output of the ADC, the output of the offset calibration circuit having a width of N+M bits; a gain calibration circuit having an input, a control input, and an output, the input of the gain calibration circuit being coupled to the output of the offset calibration circuit, the output of the gain calibration circuit having a width of N bits; and control logic coupled to the control input of the offset calibration circuit and the control input of the gain calibration circuit. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of calibrating an analog-to-digital (A/D) conversion system having an N-bit resolution, the method comprising:
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generating, at an analog-to-digital converter (ADC), an output having N most significant bits (MSBs) and M least significant bits (LSBs), where N and M are integers greater than zero; determining an offset in the ADC; compensating an output of the ADC using the offset to provide an N+M bit offset corrected output; determining a gain correction factor for the ADC; and compensating the N+M bit offset corrected output using the gain correction factor to provide an N bit offset and gain corrected output. - View Dependent Claims (17, 18, 19, 20)
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Specification