Speaker : Ankesh Jain (EE09D011 )
Continuous-time Delta Sigma Modulators based on 1-bit quantizers with FIR feedback combine the advantages of single-bit and multibit operation. At GHz clock rates, even the FIR-DAC approach begins to run into difficulties due to the limited time available for regeneration. This work uses a time-interleaved 1-bit ADC and 8-tap FIR-DACs to address this problem. Digital calibration (implemented off-chip) addresses mismatch in the interleaved sections, and rise-fall asymmetry in the feedback DAC waveforms.