| This dissertation presents a background calibration technique of successive approximation register (SAR) analog-to-digital converter (ADC) and a FPGA emulation platform for fast verification. The bit-weight calibration of a sub-binary weighted SAR ADC is based on the internal redundancy dithering (IRD) technique. A coarse ADC is employed as the reference path to remove the input interference problem in correlation-based background calibration. A custom FPGA emulation platform is developed to verify the proposed calibration approach, which achieves a 3000 speedup for the same simulation executed on a general-purpose microprocessor. Emulation results show that the signal-to-noise plus distortion ratio (SNDR) and spurious-free dynamic range (SFDR) are improved from 56dB to 89dB and 64dB to 115dB, respectively, for a sub-binary-weighted 16-bit SAR ADC with 1% DAC mismatch errors. |
