Folding analog to digital converter capable of calibration and method thereof
AssigneeRealtek Semiconductor Corp.
InventorFritz Juergen Hertle
Life of this patent
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Abstract
An ADC is disclosed comprising at least one folder receiving an input voltage, generating a first output voltage and a second output voltage, and including a plurality of amplifiers and calibration logic for generating bias control signals according to the first output voltage and the second output voltage. Each of the amplifier receives one of a plurality of reference voltages and comprises a bias circuit for providing a bias current to the amplifier based on at least one of a plurality of bias control signals. During calibration, the calibration logic provides the bias control signals to control the bias circuit of each amplifier in the folder such that the first output voltage is substantially the same as the second output voltage.
Claims12
An analog to digital converter (ADC) comprising:
- at least one folder receiving an input voltage, generating a first output voltage and a second output voltage, and including:
- a plurality of amplifiers, wherein each of the amplifier receives one of a plurality of reference voltages and comprises:
- a bias circuit for providing a bias current to the amplifier based on at least one of a plurality of bias control signals;
- and
- calibration logic for generating the bias control signals according to the first output voltage and the second output voltage;
- wherein during calibration, the calibration logic provides the bias control signals to control the bias circuit of each amplifier in the folder such that the first output voltage is substantially the same as the second output voltage.
A method of calibrating an analog to digital converter (ADC) having at least one folder receiving an input voltage, generating a first output voltage and a second output voltage, and including a plurality of amplifiers, each amplifier is for receiving one of a plurality of reference voltages;
- wherein, for each amplifier in each folder, the method comprises the following steps:
- setting the input voltage to be substantially the same as the reference voltage corresponding to the amplifier;
- and
- adjusting at least one of the bias currents of the amplifier based on the first and the second output voltage such that the first output voltage is substantially the same as the second output voltage.
Dependencies are inferred from the claim text.