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In this paper we propose a digital blind calibration scheme for Time-Interleaved ADCs based on transfer function mismatch which corrects gain, time-skew and bandwidth mismatch errors. The estimation of mismatches uses an adaptive filtering structure with a lowpass filter combined to a fractional delay filter. The compensation is based on the development of a matrix approach to cancel the effect of...
The estimation of mismatch-induced errors between the channels of a Time-Interleaved ADC is crucial for implementing an efficient calibration method. This step is often done with the assumption that all the noise sources have a white gaussian distribution. In this paper we analyze the statistical properties of noise components in wideband ADCs in terms of Probability Density Function (PDF) and Power...
The bootstrap technique is known to increase the linearity of Sample and Hold (S/H) circuit by reducing the input signal dependency of the transistor-switch resistance. But some nonlinearities remain due to parasitic capacitances, mobility degradation and back gate effect resulting in a second order harmonic spurious which can be reduced with a differential architecture. However mismatch between channels...
Impairments between ADCs are known to severely limit the resolution and bandwidth of time-interleaved (TI) architecture. This paper proposes a general framework describing simultaneously the gain, time-skew, bandwidth and offset mismatches. Statistical laws are analytically derived. They convert SFDR specifications into matching requirements and therefore provide key rules for TI-ADCs designers.
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