US 2026/0246477 A1Published application

Time-interleaved analog-to-digital converter and calibration method therefor

AssigneeRealtek Semiconductor Corp.

InventorSHIH-HSIUNG HUANG

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Abstract

A time-interleaved analog-to-digital converter (TIADC) includes first and second asynchronous sub-analog-to-digital converters (ADCs). The first and second asynchronous sub-ADCs convert an input signal at different time points to respectively generate a first digital output code and a second digital output code. The first and second asynchronous sub-ADCs respectively generate a first conversion completion signal and a second conversion completion signal upon completion of one analog-to-digital conversion operation. A method for calibrating the TIADC includes the following steps: generating a control signal according to the first conversion completion signal and the second conversion completion signal; and changing the conversion speed of an analog-to-digital conversion operation of at least one of the first asynchronous sub-ADC and the second asynchronous sub-ADC according to the control signal.

Claims16

Dependent claims

A time-interleaved analog-to-digital converter (TIADC) configured to convert an input signal to generate a digital output signal, comprising:

an analog-to-digital converter (ADC) group comprising a first asynchronous sub-ADC and a second asynchronous sub-ADC, wherein the first asynchronous sub-ADC and the second asynchronous sub-ADC convert the input signal at different time points to respectively generate a first digital output code and a second digital output code, and the first asynchronous sub-ADC and the second asynchronous sub-ADC respectively generate a first conversion completion signal and a second conversion completion signal upon completion of one analog-to-digital conversion operation;
a digital code calibration circuit coupled to the ADC group and configured to correct one of the first digital output code and the second digital output code to obtain the digital output signal;
and
a sub-ADC calibration circuit coupled to the ADC group and the digital code calibration circuit and configured to generate a control signal according to the first conversion completion signal and the second conversion completion signal;
wherein at least one of the first asynchronous sub-ADC and the second asynchronous sub-ADC changes a conversion speed of an analog-to-digital conversion operation according to the control signal.

2 more elements

A method for calibrating a time-interleaved analog-to-digital converter (TIADC) that comprises a first asynchronous sub-ADC and a second asynchronous sub-ADC, wherein the first asynchronous sub-ADC and the second asynchronous sub-ADC convert an input signal at different time points to respectively generate a first digital output code and a second digital output code, and the first asynchronous sub-ADC and the second asynchronous sub-ADC respectively generate a first conversion completion signal and a second conversion completion signal upon completion of one analog-to-digital conversion operation, the method comprising:

generating a control signal according to the first conversion completion signal and the second conversion completion signal;
and
changing a conversion speed of an analog-to-digital conversion operation of at least one of the first asynchronous sub-ADC and the second asynchronous sub-ADC according to the control signal.

Dependencies are inferred from the claim text.