A 2.5mW 12MHz-BW 69dB SNDR Passive Bandpass ΔΣ ADC with Highpass Noise-Shaping SAR Quantizers

A 4
^th
-order passive bandpass $\Delta \Sigma$ modulator (BPDSM) using a 2- path transformation structure is presented. The proposed BPDSM replaces a power-hungry resonator with a z-to-z
²
-transformed passive loop filter. The prototype bandpass $\Delta \Sigma$ ADC provides a wide intermediate frequency (IF) range of 1.25MHz to 60MHz. The measured SNDR is 69dB with a power consumption of 2.5mW at 12MHz bandwidth when its highest sampling rate is 240MS/s.