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The pseudorandom noise dither (PN dither) technique is used to measure domain-extended pipeline analog-to-digital 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 variable-amplitude dithering for domain-extended pipeline ADCs is used in this research to overcome these disadvantages. The proposed algorithm is implemented in a 12-bit, 100 MS/s sample-rate pipeline ADC. The simulation results illustrate both static and dynamic performance improvement after calibration. Moreover, the convergence speed is much faster.

A Digital Calibration Algorithm with Variable-Amplitude Dithering for Domain-Extended Pipeline ADCs