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A single channel 6-bit 900MS/s 2-bits per stage asynchronous binary search ADC

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2 Author(s)
Mesgarani, A. ; Electr. & Comput. Eng., Univ. of Idaho, Moscow, ID, USA ; Ay, S.U.

This paper presents a new single channel 6-bit 900MS/s asynchronous binary search analog to digital converter (ADC). The proposed ADC works based on binary search principle like the Successive Approximation Register (SAR) ADC. Compared to SAR ADC the speed is improved significantly adopting two design techniques. By implementing the binary search in an open loop configuration using asynchronous clock generation the delay in the feedback path of the SAR ADC is relaxed significantly. Moreover in the proposed asynchronous binary search ADC two bits are resolved in each stage of the ADC. By resolving two bits in each stage the proposed ADC can operate twice as fast as conventional asynchronous binary search ADCs. The proposed single channel 6-bit 900MS/s ADC was designed in 90nm CMOS process. Simulation results show that the proposed ADC reaches a peak SNDR of 35.82dB consuming 4.33mW from a single 1.2V power supply. It achieves of 95.3fJ/conv.code FoM.

Published in:

Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on

Date of Conference:

7-10 Aug. 2011

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