A fourth order bandpass delta-sigma A/D converter with input modulation network and digitally programmable passband

A fourth order bandpass /spl Delta//spl Sigma/ A/D converter with input modulation network and digitally programmable noise-shaping has been designed and implemented in a 2 /spl mu/m double poly, double metal n-well CMOS process. The design uses a switched-capacitor cascade-of-resonators topology with half-delay integrators and achieves a peak SNR of 73 dB over a 0.005/spl pi/ input bandwidth.