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The pseudorandom noise dither (PN dither) technique is used to measure domainextended pipeline
analogtodigital converter (ADC) gain errors and to calibrate them digitally, while the digital error
correction technique is used to correct the comparator offsets through the use of redundancy bits. However,
both these techniques suffer from three disadvantages: slow convergence speed, deduction of the amplitude
of the transmitting signal, and deduction of the redundancy space. A digital calibration algorithm with
variableamplitude dithering for domainextended pipeline ADCs is used in this research to overcome these
disadvantages. The proposed algorithm is implemented in a 12bit, 100 MS/s samplerate pipeline ADC.
The simulation results illustrate both static and dynamic performance improvement after calibration.
Moreover, the convergence speed is much faster.
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