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US 7,253,762 B2Granted
Estimation circuit for time-interleaved ADC and method thereof
AssigneeRealtek Semiconductor Corp.
InventorsFong-Ching Huang, Chao-Cheng Lee
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Abstract
The present invention provides an apparatus and a method for estimating at least one of timing, gain, and offset errors of a time-interleaved ADC. The apparatus has a first ADC, a second ADC, a converter, an estimator, and a compensator. The converter has a Fourier Transform converter and a calculator.
Claims19
A method for estimating an error of a time-interleaved analog-to-digital converter (ADC), comprising:
- utilizing a first ADC of the time-interleaved ADC to sample an input signal with a sampling-frequency f0 to generate a first sampled data;
- utilizing a second ADC of the time-interleaved ADC to sample the input signal with the sampling-frequency f0 to generate a second sampled data;
- respectively converting the first and the second sampled data by a first single-point FFT unit and a second single-point FFT unit according to a frequency component of the input signal to generate a first complex number Z1 and a second Z2 complex number, wherein the first complex number Z1 and the second Z2 complex number are corresponding to the same frequency;
- and
- generating an estimated value of the error according to the first and the second complex numbers.
2 more elements
An apparatus for estimating an error of a time-interleaved analog-to-digital converter (ADC), comprising:
- a first ADC to sample an input signal with a sampling-frequency f0 to generate a first sampled data;
- a second ADC to sample the input signal with the sampling-frequency f0 to generate a second sampled data;
- a first single-point FFT, coupled to the first ADC, for converting the first sampled data according to a frequency component of the input signal to generate a first complex number Z1;
- a second single-point FFT, coupled to the second ADC, for converting the second sampled data according to the frequency component of the input signal to generate a second complex number Z2, wherein the first complex number Z1 and the second Z2 complex number are corresponding to the same frequency;
- and
- an estimator, coupled to the converter, to generate an estimated value of the error according to the first and the second complex numbers.
3 more elements
Dependencies are inferred from the claim text.