Bandpass ΔΣ ADC using pipelined SAR ADC

This Letter proposes a second‐order bandpass ΔΣ ADC using a pipelined successive‐approximation‐register (SAR) ADC as an internal quantiser. The second‐order bandpass noise‐shaping is achieved by utilising the residue signal after SAR conversion and inherent delay existing in a pipelined structure. The proposed ADC can show very high resolution even with low‐order noise‐shaping and low oversampling ratio. Also, it shows good energy efficiency and a high sampling rate due to the use of a pipelined SAR ADC as a quantiser.