A single SAR ADC converting multi-channel sparse signals

W Guo, Y Kim, A Sanyal, A Tewfik… - 2013 IEEE International …, 2013 - ieeexplore.ieee.org
2013 IEEE International Symposium on Circuits and Systems (ISCAS), 2013ieeexplore.ieee.org
This paper presents a simple but high performance architecture for multi-channel analog-to-
digital conversion. Based on compressive sensing, only one SAR ADC is needed to convert
multi-channel sparse inputs, leading to significant analog power saving and hardware
saving. Moreover, it helps avoid problems occurring in conventional multi-channel ADCs
such as timing skew, offset mismatch, and gain mismatch. A 12-bit SAR ADC converting 4-
channel sparse signals simultaneously is designed in 130nm CMOS process. The design …
This paper presents a simple but high performance architecture for multi-channel analog-to-digital conversion. Based on compressive sensing, only one SAR ADC is needed to convert multi-channel sparse inputs, leading to significant analog power saving and hardware saving. Moreover, it helps avoid problems occurring in conventional multi-channel ADCs such as timing skew, offset mismatch, and gain mismatch. A 12-bit SAR ADC converting 4-channel sparse signals simultaneously is designed in 130nm CMOS process. The design reaches a SNDR of 66.3dB and consumes an average power of 58μW at the sampling frequency of 1MHz. The L 1 minimization method is chosen to reconstruct the input signals. The single-tone and multi-tone inputs can be reconstructed with a minimum precision of 68dB and 55dB THD, respectively.
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