A 250-MHz Pipelined ADC-Based fS/4 Noise-Shaping Bandpass ADC. - Vineeth Sarma; Nevin Alex Jacob; Bibhudatta Sahoo 002; Venkateswaran Narayanaswamy; Vikas Choudhary (IEEE Trans. Circuits Syst. I Regul. Pap., 2018)